1173 + Interview Questions in Statistics Page 3 InterviewSolution

101.	A student writes four different expressions for the displacement x in a periodic motion as a function of time t, A as amplitude, T as time period. Which of the following can be correct? (1) x= AT sin 2.pi.t/T (2) x= A.A Tcost (3) x= A/Tcost/a (4) x= A/2power1/2[sin2pi t/T +cos2pi t/T
Answer» A student writes four different expressions for the displacement x in a periodic motion as a function of time t, A as amplitude, T as time period. Which of the following can be correct? (1) x= AT sin 2.pi.t/T (2) x= A.A Tcost (3) x= A/Tcost/a (4) x= A/2power1/2[sin2pi t/T +cos2pi t/T

Discussion

102.

Calculate mean deviation from the median of the following data: [NCERT EXEMPLAR] Class interval: 0–6 6–12 12–18 18–24 24–30 Frequency 4 5 3 6 2

Answer» Calculate mean deviation from the median of the following data: [NCERT EXEMPLAR]

Class interval:	0–6	6–12	12–18	18–24	24–30
Frequency	4	5	3	6	2

Discussion

103.	Find the missing frequency in the following distribution if N is 60 and the median is 40. Marks)0−1010−3030−6060−8080−90Frequency5F1F282
Answer» Find the missing frequency in the following distribution if N is 60 and the median is 40. $\begin{matrix} Marks) & 0 - 10 & 10 - 30 & 30 - 60 & 60 - 80 & 80 - 90 Frequency & 5 & F 1 & F 2 & 8 & 2 \end{matrix}$

103.

Find the missing frequency in the following distribution if N is 60 and the median is 40. Marks)0−1010−3030−6060−8080−90Frequency5F1F282

Answer»

Find the missing frequency in the following distribution if N is 60 and the median is 40.

$\begin{matrix} Marks) & 0 - 10 & 10 - 30 & 30 - 60 & 60 - 80 & 80 - 90 Frequency & 5 & F 1 & F 2 & 8 & 2 \end{matrix}$

Discussion

104.	The mean of first five prime numbers is(a) 5.6 (b) 5.5 (c) 5.4 (d) 5.2
Answer» The mean of first five prime numbers is (a) 5.6 (b) 5.5 (c) 5.4 (d) 5.2

Discussion

105.	The range of the data : 25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is __________.
Answer» The range of the data : 25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is __________.

Discussion

106.

Calculate mode of the following series using the graphic technique. Counter check the modal value with the formula. Wage 0−10 10−20 20−30 30−40 40−50 Number of Workers 28 46 54 42 30

Answer» Calculate mode of the following series using the graphic technique. Counter check the modal value with the formula.

Wage	0−10	10−20	20−30	30−40	40−50
Number of Workers	28	46	54	42	30

Discussion

107.	The mean ¯x of a discrete series of data is given by:
Answer» The mean $¯ x$ of a discrete series of data is given by:

Discussion

108.	Calculate arithmetic mean from the following data: Marks0−1010−2020−4040−7070−100No. of Students8123064
Answer» Calculate arithmetic mean from the following data: $\begin{matrix} Marks & 0 - 10 & 10 - 20 & 20 - 40 & 40 - 70 & 70 - 100 No. of Students & 8 & 12 & 30 & 6 & 4 \end{matrix}$

108.

Calculate arithmetic mean from the following data: Marks0−1010−2020−4040−7070−100No. of Students8123064

Answer»

Calculate arithmetic mean from the following data:

$\begin{matrix} Marks & 0 - 10 & 10 - 20 & 20 - 40 & 40 - 70 & 70 - 100 No. of Students & 8 & 12 & 30 & 6 & 4 \end{matrix}$

Discussion

109.	Make a scatter diagram for the following data and state the type of correlation between X and Y. X1020304050Y70140210280350
Answer» Make a scatter diagram for the following data and state the type of correlation between X and Y. $\begin{matrix} X & 10 & 20 & 30 & 40 & 50 Y & 70 & 140 & 210 & 280 & 350 \end{matrix}$

109.

Make a scatter diagram for the following data and state the type of correlation between X and Y. X1020304050Y70140210280350

Answer»

Make a scatter diagram for the following data and state the type of correlation between X and Y.

$\begin{matrix} X & 10 & 20 & 30 & 40 & 50 Y & 70 & 140 & 210 & 280 & 350 \end{matrix}$

Discussion

110.	Find the mean and variance for the following frequency distribution. Class 0−10 10−20 20−30 30−40 40−50 Frequencies 5 8 15 16 6
Answer» Find the mean and variance for the following frequency distribution. $\begin{matrix} Class & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 Frequencies & 5 & 8 & 15 & 16 & 6 \end{matrix}$

110.

Find the mean and variance for the following frequency distribution. Class 0−10 10−20 20−30 30−40 40−50 Frequencies 5 8 15 16 6

Answer»

Find the mean and variance for the following frequency distribution.

$\begin{matrix} Class & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 Frequencies & 5 & 8 & 15 & 16 & 6 \end{matrix}$

Discussion

111.	Explain why environmental problems are simultaneously social problems.
Answer» Explain why environmental problems are simultaneously social problems.

Discussion

112.	44. A speaks truth in 60% of the cases and B in 90% of the cases In what percentage of cases are they likely to contradict each other in stating the same fact ?
Answer» 44. A speaks truth in 60% of the cases and B in 90% of the cases In what percentage of cases are they likely to contradict each other in stating the same fact ?

Discussion

113.	What does 20% of 50 mean?
Answer» What does 20% of 50 mean?

Discussion

114.	Complete the following chart:
Answer» Complete the following chart:

Discussion

115.

Calculate the mean deviation about the mean for the following frequency distribution: Class interval: 0–4 4–8 8–12 12–16 16–20 Frequency 4 6 8 5 2

Answer» Calculate the mean deviation about the mean for the following frequency distribution:

Class interval:	0–4	4–8	8–12	12–16	16–20
Frequency	4	6	8	5	2

Discussion

116.	What are the major environmental issues associated with resource depletion?
Answer» What are the major environmental issues associated with resource depletion?

Discussion

117.	How is retrieval related forgetting different from forgetting due to interference?
Answer» How is retrieval related forgetting different from forgetting due to interference?

Discussion

118.	Rectify the following errors. (i) Credit sales to Mohan Rs. 7,000 were recorded as Rs. 7,200. (ii) Credit purchase from Rohan Rs. 9,000 were recorded as Rs. 9,900. (iii) Goods returned to Rakesh Rs. 4,000 were recorded as Rs. 4,040. (iv) Goods returned from Mahesh Rs. 1,000 were recorded as Rs. 1,600. (v) Cash sale of Rs. 3,400 to Aroha was posted to the credit of Aroha. (vi) Credit sale of old furniture to X for Rs. 3,400 was credited to the sales account. (vii) Credit sale of old furniture to Vishal for Rs. 1,700 was posted as Rs. 7,100.
Answer» Rectify the following errors. (i) Credit sales to Mohan Rs. 7,000 were recorded as Rs. 7,200. (ii) Credit purchase from Rohan Rs. 9,000 were recorded as Rs. 9,900. (iii) Goods returned to Rakesh Rs. 4,000 were recorded as Rs. 4,040. (iv) Goods returned from Mahesh Rs. 1,000 were recorded as Rs. 1,600. (v) Cash sale of Rs. 3,400 to Aroha was posted to the credit of Aroha. (vi) Credit sale of old furniture to X for Rs. 3,400 was credited to the sales account. (vii) Credit sale of old furniture to Vishal for Rs. 1,700 was posted as Rs. 7,100.

118.

Rectify the following errors. (i) Credit sales to Mohan Rs. 7,000 were recorded as Rs. 7,200. (ii) Credit purchase from Rohan Rs. 9,000 were recorded as Rs. 9,900. (iii) Goods returned to Rakesh Rs. 4,000 were recorded as Rs. 4,040. (iv) Goods returned from Mahesh Rs. 1,000 were recorded as Rs. 1,600. (v) Cash sale of Rs. 3,400 to Aroha was posted to the credit of Aroha. (vi) Credit sale of old furniture to X for Rs. 3,400 was credited to the sales account. (vii) Credit sale of old furniture to Vishal for Rs. 1,700 was posted as Rs. 7,100.

Answer»

Rectify the following errors.

(i) Credit sales to Mohan Rs. 7,000 were recorded as Rs. 7,200.

(ii) Credit purchase from Rohan Rs. 9,000 were recorded as Rs. 9,900.

(iii) Goods returned to Rakesh Rs. 4,000 were recorded as Rs. 4,040.

(iv) Goods returned from Mahesh Rs. 1,000 were recorded as Rs. 1,600.

(v) Cash sale of Rs. 3,400 to Aroha was posted to the credit of Aroha.

(vi) Credit sale of old furniture to X for Rs. 3,400 was credited to the sales account.

(vii) Credit sale of old furniture to Vishal for Rs. 1,700 was posted as Rs. 7,100.

Discussion

119.

Calculate average of the following discrete series. Use Short-cut Method by taking 25 as assumed average. Size 30 29 28 27 26 25 24 23 22 21 Frequency (f) 2 4 5 3 2 7 1 4 5 7

Answer» Calculate average of the following discrete series. Use Short-cut Method by taking 25 as assumed average.

Size	30	29	28	27	26	25	24	23	22	21
Frequency (f)	2	4	5	3	2	7	1	4	5	7

Discussion

120.	Mention the three most commonly used measures of central tendency.
Answer» Mention the three most commonly used measures of central tendency.

Discussion

121.	Why and how does social organisation shape the relationship between the environment and society?
Answer» Why and how does social organisation shape the relationship between the environment and society?

Discussion

122.	Let p: Roses are red and q: The sun is a star. Then the verbal translation of ∼p ∨ q is
Answer» Let p: Roses are red and q: The sun is a star. Then the verbal translation of $\sim p \lor q$ is

Discussion

123.	Which of the following resembles most a direct democracy? a. Discussions in a family meeting b. Election of the class monitor c. Choice of a candidate by a political party d. Decisions taken by the Gram Sabha e. Opinion polls conducted by the media
Answer» Which of the following resembles most a direct democracy? a. Discussions in a family meeting b. Election of the class monitor c. Choice of a candidate by a political party d. Decisions taken by the Gram Sabha e. Opinion polls conducted by the media

123.

Which of the following resembles most a direct democracy? a. Discussions in a family meeting b. Election of the class monitor c. Choice of a candidate by a political party d. Decisions taken by the Gram Sabha e. Opinion polls conducted by the media

Answer»

Which
of the following resembles most a direct democracy?

a.
Discussions in a family meeting

b.
Election of the class monitor

c.
Choice of a candidate by a political party

d.
Decisions taken by the Gram Sabha

e.
Opinion polls conducted by the media

Discussion

124.	The consumer price index for June, 2002 was 98. The food index was 79 and that of other items 117. What is the percentage of the total weight given to food?
Answer» The consumer price index for June, 2002 was 98. The food index was 79 and that of other items 117. What is the percentage of the total weight given to food?

Discussion

125.	The range of simple correlation coefficient is(i) 0 to infinity(ii) minus one to plus one(iii) minus infinity to infinity
Answer» The range of simple correlation coefficient is (i) 0 to infinity (ii) minus one to plus one (iii) minus infinity to infinity

125.

The range of simple correlation coefficient is(i) 0 to infinity(ii) minus one to plus one(iii) minus infinity to infinity

Answer»

The range of simple correlation coefficient is

(i) 0 to infinity

(ii) minus one to plus one

(iii) minus infinity to infinity

Discussion

126.	Calculate mean deviation from median and its coefficient for the following data : X10−1920−2930−3940−4950−59f34652
Answer» Calculate mean deviation from median and its coefficient for the following data : $\begin{matrix} X & 10 - 19 & 20 - 29 & 30 - 39 & 40 - 49 & 50 - 59 f & 3 & 4 & 6 & 5 & 2 \end{matrix}$

126.

Calculate mean deviation from median and its coefficient for the following data : X10−1920−2930−3940−4950−59f34652

Answer»

Calculate mean deviation from median and its coefficient for the following data :

$\begin{matrix} X & 10 - 19 & 20 - 29 & 30 - 39 & 40 - 49 & 50 - 59 f & 3 & 4 & 6 & 5 & 2 \end{matrix}$

Discussion

127.	The height of a rectangle in a histogram shows the(a) width of the class(b) upper limit of the class(c) lower limit of the class(d) frequency of the class
Answer» The height of a rectangle in a histogram shows the (a) width of the class (b) upper limit of the class (c) lower limit of the class (d) frequency of the class

127.

The height of a rectangle in a histogram shows the(a) width of the class(b) upper limit of the class(c) lower limit of the class(d) frequency of the class

Answer»

The height of a rectangle in a histogram shows the

(a) width of the class

(b) upper limit of the class

(c) lower limit of the class

(d) frequency of the class

Discussion

128.

Construct the simple frequency distribution from the following data: Mid-value 5 15 25 35 45 55 Frequency 2 8 15 12 7 6

Answer» Construct the simple frequency distribution from the following data:

Mid-value	5	15	25	35	45	55
Frequency	2	8	15	12	7	6

Discussion

129.	For perfect positive correlation, the value of r = ___
Answer» For perfect positive correlation, the value of r = ___

Discussion

130.	The standard deviation is _____________ to the mean deviation taken from the arithmetic mean.
Answer» The standard deviation is _____________ to the mean deviation taken from the arithmetic mean.

Discussion

131.	Discuss the strengths and weaknesses of experimental method as a method of enquiry.
Answer» Discuss the strengths and weaknesses of experimental method as a method of enquiry.

Discussion

132.	Prepare the frequency array of marks obtained by 25 students of a class in Economics test. 20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45.
Answer» Prepare the frequency array of marks obtained by 25 students of a class in Economics test. 20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45.

132.

Prepare the frequency array of marks obtained by 25 students of a class in Economics test. 20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45.

Answer»

Prepare the frequency array of marks obtained by 25 students of a class in Economics test.

20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45.

Discussion

133.	Mean is also called as ___.
Answer» Mean is also called as ___.

Discussion

134.	Following is some information regarding a town’s expenditure: Expenses on itemsFood 50%Fuel 8%Clothing 22%Rent 5%Misc 15%Price (in Rs.)in 20092200301912500247Price (in Rs.)in 19871504125333300200 What is the cost of living index of the year 2000 as compared with the year 1990?
Answer» Following is some information regarding a town’s expenditure: $\begin{matrix} Expenses on items & Food 50 % & Fuel 8 % & Clothing 22 % & Rent 5 % & Misc 15 % Price (in Rs.)in 2009 & 2200 & 301 & 912 & 500 & 247 Price (in Rs.)in 1987 & 1504 & 125 & 333 & 300 & 200 \end{matrix}$ What is the cost of living index of the year 2000 as compared with the year 1990?

134.

Following is some information regarding a town’s expenditure: Expenses on itemsFood 50%Fuel 8%Clothing 22%Rent 5%Misc 15%Price (in Rs.)in 20092200301912500247Price (in Rs.)in 19871504125333300200 What is the cost of living index of the year 2000 as compared with the year 1990?

Answer»

Following is some information regarding a town’s expenditure:

$\begin{matrix} Expenses on items & Food 50 % & Fuel 8 % & Clothing 22 % & Rent 5 % & Misc 15 % Price (in Rs.)in 2009 & 2200 & 301 & 912 & 500 & 247 Price (in Rs.)in 1987 & 1504 & 125 & 333 & 300 & 200 \end{matrix}$

What is the cost of living index of the year 2000 as compared with the year 1990?

Discussion

135.

In the following frequency distribution, ifthe arithmetic mean is 45.6, find out missing frequency. Wages (₹) 10−20 20−30 30−40 40−50 50−60 60−70 70−80 Number of Workers 5 6 7 X 4 3 9

Answer» In the following frequency distribution, ifthe arithmetic mean is 45.6, find out missing frequency.

Wages (₹)	10−20	20−30	30−40	40−50	50−60	60−70	70−80
Number of Workers	5	6	7	X	4	3	9

Discussion

136.	The annual sales of cell phones for the last 5 years in the city of Chennai would fall under which particular type of classification? YearSale (Units)201454,000201568,000201692,00020171,10,00020181,22,000
Answer» The annual sales of cell phones for the last 5 years in the city of Chennai would fall under which particular type of classification? $\begin{matrix} Year & Sale (Units) 2014 & 54, 000 2015 & 68, 000 2016 & 92, 000 2017 & 1, 10, 000 2018 & 1, 22, 000 \end{matrix}$

Discussion

137.	Find the mean and variance for the following frequency distribution. Class 0−30 30−60 60−90 90−120 120−150 150−180 180−210 Frequencies 2 3 5 10 3 5 2
Answer» Find the mean and variance for the following frequency distribution. $\begin{matrix} Class & 0 - 30 & 30 - 60 & 60 - 90 & 90 - 120 & 120 - 150 & 150 - 180 & 180 - 210 Frequencies & 2 & 3 & 5 & 10 & 3 & 5 & 2 \end{matrix}$

137.

Find the mean and variance for the following frequency distribution. Class 0−30 30−60 60−90 90−120 120−150 150−180 180−210 Frequencies 2 3 5 10 3 5 2

Answer»

Find the mean and variance for the following frequency distribution.

$\begin{matrix} Class & 0 - 30 & 30 - 60 & 60 - 90 & 90 - 120 & 120 - 150 & 150 - 180 & 180 - 210 Frequencies & 2 & 3 & 5 & 10 & 3 & 5 & 2 \end{matrix}$

Discussion

138.	The standard deviation of data is _________________ of any change in origin, but is _____________ on the change of scale.
Answer» The standard deviation of data is _________________ of any change in origin, but is _____________ on the change of scale.

Discussion

139.	Find the value of variables k and d for the following data using Simple aggregative method provided the average prices of commodities have increased by 50% over the given period.Also given is the relation between k and d defined by k2+d2=149. CommoditiesABCDEPrice in 2000 (Rs.)10122k23Price in 2006 (Rs.)1417d931
Answer» Find the value of variables k and d for the following data using Simple aggregative method provided the average prices of commodities have increased by 50% over the given period.Also given is the relation between k and d defined by $k^{2} + d^{2} = 149.$ $\begin{matrix} Commodities & A & B & C & D & E Price in 2000 (Rs.) & 10 & 12 & 2 & k & 23 Price in 2006 (Rs.) & 14 & 17 & d & 9 & 31 \end{matrix}$

139.

Find the value of variables k and d for the following data using Simple aggregative method provided the average prices of commodities have increased by 50% over the given period.Also given is the relation between k and d defined by k2+d2=149. CommoditiesABCDEPrice in 2000 (Rs.)10122k23Price in 2006 (Rs.)1417d931

Answer»

Find the value of variables k and d for the following data using Simple aggregative method provided the average prices of commodities have increased by 50% over the given period.Also given is the relation between k and d defined by $k^{2} + d^{2} = 149.$

$\begin{matrix} Commodities & A & B & C & D & E Price in 2000 (Rs.) & 10 & 12 & 2 & k & 23 Price in 2006 (Rs.) & 14 & 17 & d & 9 & 31 \end{matrix}$

Discussion

140.	Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given monthly ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months. Rating688.59710Number of months with the rating2810785 Calculate how his rating is deviating from his average performance in terms of mean deviation about mean.
Answer» Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given monthly ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months. $\begin{matrix} R a t i n g & 6 & 8 & 8.5 & 9 & 7 & 10 N u m b e r o f m o n t h s w i t h t h e r a t i n g & 2 & 8 & 10 & 7 & 8 & 5 \end{matrix}$ Calculate how his rating is deviating from his average performance in terms of mean deviation about mean.

140.

Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given monthly ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months. Rating688.59710Number of months with the rating2810785 Calculate how his rating is deviating from his average performance in terms of mean deviation about mean.

Answer»

Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given monthly ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months.

$\begin{matrix} R a t i n g & 6 & 8 & 8.5 & 9 & 7 & 10 N u m b e r o f m o n t h s w i t h t h e r a t i n g & 2 & 8 & 10 & 7 & 8 & 5 \end{matrix}$

Calculate how his rating is deviating from his average performance in terms of mean deviation about mean.

Discussion

141.	In the ___ method of calculating mean, we divide the deviations by a common factor to simplify calculations.
Answer» In the ___ method of calculating mean, we divide the deviations by a common factor to simplify calculations.

Discussion

142.	The first Census of India after the Independence was taken in the year ___ .
Answer» The first Census of India after the Independence was taken in the year ___ .

Discussion

143.	Give the formula for estimating mode in case of continuous series.
Answer» Give the formula for estimating mode in case of continuous series.

Discussion

144.

Given the following data: Year CPI of Industrial Workers (1982 = 100) CPI of Urban Non-manual Employees (1984-85 = 100) CPI of Agricultural Labourers (1986-87 = 100) WPI (1993-94 = 100) 1995–96 313 257 234 121.6 1996–97 342 283 256 127.2 1997–98 366 302 264 132.8 1998–99 414 337 293 140.7 1999–00 428 352 306 145.3 2000–01 444 352 306 155.7 2001–02 463 390 309 161.3 2002–03 482 405 319 166.8 2003–04 500 420 331 175.9 Source: Economic Survey, Government of India 2004-2005 (i) Calculate the inflation rates using different index numbers.(ii) Comment on the relative values of the index numbers.(iii) Are they comparable?

Answer»

Given the following data:

Year	CPI of Industrial Workers (1982 = 100)	CPI of Urban Non-manual Employees (1984-85 = 100)	CPI of Agricultural Labourers (1986-87 = 100)	WPI (1993-94 = 100)
1995–96	313	257	234	121.6
1996–97	342	283	256	127.2
1997–98	366	302	264	132.8
1998–99	414	337	293	140.7
1999–00	428	352	306	145.3
2000–01	444	352	306	155.7
2001–02	463	390	309	161.3
2002–03	482	405	319	166.8
2003–04	500	420	331	175.9

Source: Economic Survey, Government of India 2004-2005

(i) Calculate the inflation rates using different index numbers.

(ii) Comment on the relative values of the index numbers.

(iii) Are they comparable?

Discussion

145.

Calculate mode of the following series, using grouping method: Size 40 44 48 52 56 60 64 68 72 76 Frequency 10 12 14 20 15 20 18 10 8 4

Answer» Calculate mode of the following series, using grouping method:

Size	40	44	48	52	56	60	64	68	72	76
Frequency	10	12	14	20	15	20	18	10	8	4

Discussion

146.	What is a census survey?
Answer» What is a census survey?

Discussion

147.	We are given the following marks secured by 25 students in an examination.23, 28,30, 32, 35, 36, 36, 40, 41, 43, 44, 44, 45, 48, 49, 52, 53, 54, 56, 56, 58, 61, 62, 65, 68.(i) Arrange this data in the form of a frequency distribution taking the following class intervals.20−29, 30−39, 40−49, 50−59 and 60−69(ii) Draw the frequency polygon and ogive for the above data.
Answer» We are given the following marks secured by 25 students in an examination. 23, 28,30, 32, 35, 36, 36, 40, 41, 43, 44, 44, 45, 48, 49, 52, 53, 54, 56, 56, 58, 61, 62, 65, 68. (i) Arrange this data in the form of a frequency distribution taking the following class intervals. 20−29, 30−39, 40−49, 50−59 and 60−69 (ii) Draw the frequency polygon and ogive for the above data.

Discussion

148.

Estimate coefficient of variation of the following data: Weight (kg) 0−20 20−40 40−60 60−80 80−100 Number of Persons 81 40 66 49 14

Answer» Estimate coefficient of variation of the following data:

Weight (kg)	0−20	20−40	40−60	60−80	80−100
Number of Persons	81	40	66	49	14

Discussion

149.	Explain four measures taken by the government to improve agricultural marketing.
Answer» Explain four measures taken by the government to improve agricultural marketing.

Discussion

150.

Construct a frequency distribution with a class interval of 4 on exclusive basis for the following data: 91, 94, 111, 121, 95, 103, 99, 110, 100, 101, 92, 105, 110, 111, 93, 96, 98, 106, 94, 115

Answer»

Construct a frequency distribution with a class interval of 4 on exclusive basis for the following data:

91, 94, 111, 121, 95, 103, 99, 110, 100, 101, 92, 105, 110, 111, 93, 96, 98, 106, 94, 115

Discussion

Explore topic-wise InterviewSolutions in .

A student writes four different expressions for the displacement x in a periodic motion as a function of time t, A as amplitude, T as time period. Which of the following can be correct? (1) x= AT sin 2.pi.t/T (2) x= A.A Tcost (3) x= A/Tcost/a (4) x= A/2power1/2[sin2pi t/T +cos2pi t/T

Calculate mean deviation from the median of the following data: [NCERT EXEMPLAR] Class interval: 0–6 6–12 12–18 18–24 24–30 Frequency 4 5 3 6 2

Find the missing frequency in the following distribution if N is 60 and the median is 40. Marks)0−1010−3030−6060−8080−90Frequency5F1F282

The mean of first five prime numbers is(a) 5.6 (b) 5.5 (c) 5.4 (d) 5.2

The range of the data : 25, 18, 20, 22, 16, 6, 17, 15, 12, 30, 32, 10, 19, 8, 11, 20 is __________.

Calculate mode of the following series using the graphic technique. Counter check the modal value with the formula. Wage 0−10 10−20 20−30 30−40 40−50 Number of Workers 28 46 54 42 30

The mean ¯x of a discrete series of data is given by:

Calculate arithmetic mean from the following data: Marks0−1010−2020−4040−7070−100No. of Students8123064

Make a scatter diagram for the following data and state the type of correlation between X and Y. X1020304050Y70140210280350

Find the mean and variance for the following frequency distribution. Class 0−10 10−20 20−30 30−40 40−50 Frequencies 5 8 15 16 6

Explain why environmental problems are simultaneously social problems.

44. A speaks truth in 60% of the cases and B in 90% of the cases In what percentage of cases are they likely to contradict each other in stating the same fact ?

What does 20% of 50 mean?

Complete the following chart:

Calculate the mean deviation about the mean for the following frequency distribution: Class interval: 0–4 4–8 8–12 12–16 16–20 Frequency 4 6 8 5 2

What are the major environmental issues associated with resource depletion?

How is retrieval related forgetting different from forgetting due to interference?

Calculate average of the following discrete series. Use Short-cut Method by taking 25 as assumed average. Size 30 29 28 27 26 25 24 23 22 21 Frequency (f) 2 4 5 3 2 7 1 4 5 7

Mention the three most commonly used measures of central tendency.

Why and how does social organisation shape the relationship between the environment and society?

Let p: Roses are red and q: The sun is a star. Then the verbal translation of ∼p ∨ q is

Which of the following resembles most a direct democracy? a. Discussions in a family meeting b. Election of the class monitor c. Choice of a candidate by a political party d. Decisions taken by the Gram Sabha e. Opinion polls conducted by the media

The consumer price index for June, 2002 was 98. The food index was 79 and that of other items 117. What is the percentage of the total weight given to food?

The range of simple correlation coefficient is(i) 0 to infinity(ii) minus one to plus one(iii) minus infinity to infinity

Calculate mean deviation from median and its coefficient for the following data : X10−1920−2930−3940−4950−59f34652

The height of a rectangle in a histogram shows the(a) width of the class(b) upper limit of the class(c) lower limit of the class(d) frequency of the class

Construct the simple frequency distribution from the following data: Mid-value 5 15 25 35 45 55 Frequency 2 8 15 12 7 6

For perfect positive correlation, the value of r = ___

The standard deviation is _____________ to the mean deviation taken from the arithmetic mean.

Discuss the strengths and weaknesses of experimental method as a method of enquiry.

Prepare the frequency array of marks obtained by 25 students of a class in Economics test. 20, 15, 20, 30, 40, 25, 25, 30, 40, 20, 35, 35, 50, 15, 50, 25, 40, 40, 30, 50, 25, 30, 30, 15, 45.

Mean is also called as ___.

Following is some information regarding a town’s expenditure: Expenses on itemsFood 50%Fuel 8%Clothing 22%Rent 5%Misc 15%Price (in Rs.)in 20092200301912500247Price (in Rs.)in 19871504125333300200 What is the cost of living index of the year 2000 as compared with the year 1990?

In the following frequency distribution, ifthe arithmetic mean is 45.6, find out missing frequency. Wages (₹) 10−20 20−30 30−40 40−50 50−60 60−70 70−80 Number of Workers 5 6 7 X 4 3 9

The annual sales of cell phones for the last 5 years in the city of Chennai would fall under which particular type of classification? YearSale (Units)201454,000201568,000201692,00020171,10,00020181,22,000

Find the mean and variance for the following frequency distribution. Class 0−30 30−60 60−90 90−120 120−150 150−180 180−210 Frequencies 2 3 5 10 3 5 2

The standard deviation of data is _________________ of any change in origin, but is _____________ on the change of scale.

In the ___ method of calculating mean, we divide the deviations by a common factor to simplify calculations.

The first Census of India after the Independence was taken in the year ___ .

Give the formula for estimating mode in case of continuous series.

Calculate mode of the following series, using grouping method: Size 40 44 48 52 56 60 64 68 72 76 Frequency 10 12 14 20 15 20 18 10 8 4

What is a census survey?

Estimate coefficient of variation of the following data: Weight (kg) 0−20 20−40 40−60 60−80 80−100 Number of Persons 81 40 66 49 14

Explain four measures taken by the government to improve agricultural marketing.

Construct a frequency distribution with a class interval of 4 on exclusive basis for the following data: 91, 94, 111, 121, 95, 103, 99, 110, 100, 101, 92, 105, 110, 111, 93, 96, 98, 106, 94, 115

The standard deviation of data is _____ of any change in origin, but is _ on the change of scale.