1173 + Interview Questions in Statistics Page 13 InterviewSolution

601.	Mention two points to state the importance of Statistics in Economics.
Answer» Mention two points to state the importance of Statistics in Economics.

Discussion

602.	In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A & B are given by two line graphs. In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.
Answer» In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A & B are given by two line graphs. In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.

602.

In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A & B are given by two line graphs. In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.

Answer»

In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A & B are given by two line graphs.

In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.

Discussion

603.	Decide whether the variables given below are continuous or discrete. Give a justification for your classification.1. Number of females per 1000 males in various states of our country2. Production of wheat in the last 10 years in our country3. Number of plants in our locality4. Rainfall in our city in the last 10 years
Answer» Decide whether the variables given below are continuous or discrete. Give a justification for your classification. 1. Number of females per 1000 males in various states of our country 2. Production of wheat in the last 10 years in our country 3. Number of plants in our locality 4. Rainfall in our city in the last 10 years

Discussion

604.	range of the function f(x)={x}^{x} where {X} is fractional part of x,is where x does not belong to z SA-M-198-11
Answer» range of the function f(x)={x}^{x} where {X} is fractional part of x,is where x does not belong to z SA-M-198-11

Discussion

605.	If the increase in WPI is given by the function h(k) = (k-1)(k-3)(k-4)(k-6) +10, what could be the maximum discount margin that the wholesaler, without harming his bottom line, can provide to the retailer if the cost increase for him is given by g(k)=(1+k2), assuming that no other factors affect the situation and the wholesaler initially was earning exactly enough to meet the expenses?
Answer» If the increase in WPI is given by the function h(k) = (k-1)(k-3)(k-4)(k-6) +10, what could be the maximum discount margin that the wholesaler, without harming his bottom line, can provide to the retailer if the cost increase for him is given by $g (k) = (1 + k^{2})$ , assuming that no other factors affect the situation and the wholesaler initially was earning exactly enough to meet the expenses?

Discussion

606.	Explain the rule followed by the pattern which would give the number of coloured block in any grid on the pattern shown here?
Answer» Explain the rule followed by the pattern which would give the number of coloured block in any grid on the pattern shown here?

Discussion

607.	Students are asked to make National flag 'TIRANGA' on Independence day. As we know flag has three colours, in how many ways our national flag can be made with these three colours? What are the significance of three colours of our National flag?
Answer» Students are asked to make National flag 'TIRANGA' on Independence day. As we know flag has three colours, in how many ways our national flag can be made with these three colours? What are the significance of three colours of our National flag?

Discussion

608.	National Sample Survey (NSS) was set up in ___.
Answer» National Sample Survey (NSS) was set up in ___.

Discussion

609.	Calculate the number of observations for an accuracy of 5% confidence level of 95% if P=0.25 _____. 4610
Answer» Calculate the number of observations for an accuracy of 5% confidence level of 95% if $P = 0.25$ _____. 4610

Discussion

610.	What are the main sources of data?
Answer» What are the main sources of data?

Discussion

611.	Describe the role of small business in rural India.
Answer» Describe the role of small business in rural India.

Discussion

612.	The mean deviation from the data 3,10,4,7,10,5:
Answer» The mean deviation from the data 3,10,4,7,10,5:

Discussion

613.	A person who takes a survey to collect data first-hand from his customer is a/an ___.
Answer» A person who takes a survey to collect data first-hand from his customer is a/an ___.

Discussion

614.	Why does rank correlation coefficient differ from Pearsonian correlation coefficient?
Answer» Why does rank correlation coefficient differ from Pearsonian correlation coefficient?

Discussion

615.	In a steady state, temperature of each part of rod is
Answer» In a steady state, temperature of each part of rod is

Discussion

616.	A∩(B-C)=(A∩ B)-(A∩ C)
Answer» A∩(B-C)=(A∩ B)-(A∩ C)

Discussion

617.	Collect the price of five vegetables from your local market every day for a week. Calculate their correlation coefficients. Interpret the result.
Answer» Collect the price of five vegetables from your local market every day for a week. Calculate their correlation coefficients. Interpret the result.

Discussion

618.	For the data : 5, 4, 8, 10, 2, 3, 5, 6, 7, 8, 10, 2, 1, 4, 6, 5, 8, 7, x, 2y, y, the median is 5 and the modes are both 5 and 2y. The value of x2 + y2 is (Consider the data to be discrete)
Answer» For the data : 5, 4, 8, 10, 2, 3, 5, 6, 7, 8, 10, 2, 1, 4, 6, 5, 8, 7, x, 2y, y, the median is 5 and the modes are both 5 and 2y. The value of x2 + y2 is (Consider the data to be discrete)

Discussion

619.	The mean and the variance of five observations are 4 and 5.20, respectively. If three of observations are 3,4 and 4; then the absolute value of the difference of the other two observations, is
Answer» The mean and the variance of five observations are $4$ and $5.20$ , respectively. If three of observations are $3, 4$ and $4;$ then the absolute value of the difference of the other two observations, is

Discussion

620.	The following figure is a graph of
Answer» The following figure is a graph of

620.

The following figure is a graph of

Answer»

The following figure is a graph of

Discussion

621.	The following table gives the distribution of the life time of 400 neon lamps: Life timeNumber of lamps(in hours) 1500−2000142000−2500562500−3000603000−3500863500−4000744000−4500624500−500048Find the median life time of a lamp.
Answer» The following table gives the distribution of the life time of 400 neon lamps: $\begin{matrix} Life time & Number of lamps (in hours) 1500 - 2000 & 14 2000 - 2500 & 56 2500 - 3000 & 60 3000 - 3500 & 86 3500 - 4000 & 74 4000 - 4500 & 62 4500 - 5000 & 48 \end{matrix}$ Find the median life time of a lamp.

Discussion

622.	Let x1,x2,…,x100 be 100 observations such that 100∑i=1xi=0, ∑1≤i<j≤100\|xixj\|=80000 and mean deviation from their mean be 5. Then their standard deviation is
Answer» Let $x_{1}, x_{2}, \dots, x_{100}$ be $100$ observations such that $100 \sum i = 1 x_{i} = 0,$ $\sum 1 \leq i < j \leq 100 \| x_{i} x_{j} \| = 80000$ and mean deviation from their mean be $5.$ Then their standard deviation is

Discussion

623.	If 9 out of 36 people love eating pies, the pie chart would represent them in a ___.
Answer» If 9 out of 36 people love eating pies, the pie chart would represent them in a ___.

Discussion

624.	Describe main features of the interview as a research method.
Answer» Describe main features of the interview as a research method.

Discussion

625.	Two zero mean Gaussian random variables X1 and X2 have variances respectively; Their covariance is Cx1x2=3. These variables are linearly transformed to new random variables as follows:σ2x1=4 and σ2x2=9The value of covarience CY1Y2 will be_____Y1=X1−2X2 and Y2=3X1+4X2 -66
Answer» Two zero mean Gaussian random variables $X_{1}$ and $X_{2}$ have variances respectively; Their covariance is $C_{x_{1} x_{2}} = 3$ . These variables are linearly transformed to new random variables as follows: $σ^{2} x_{1} = 4$ and $σ^{2} x_{2} = 9$ The value of covarience $C_{Y 1 Y 2}$ will be_____ $Y_{1} = X_{1} - 2 X_{2}$ and $Y_{2} = 3 X_{1} + 4 X_{2}$ -66

Discussion

626.	The quantity of goods produced and costs incurred by a firm are tabulated below. Find the correlation coefficient using Karl Pearson's formula. Quantity producedTotal cost1012020230303154042550510
Answer» The quantity of goods produced and costs incurred by a firm are tabulated below. Find the correlation coefficient using Karl Pearson's formula. $\begin{matrix} Quantity produced & Total cost 10 & 120 20 & 230 30 & 315 40 & 425 50 & 510 \end{matrix}$

626.

The quantity of goods produced and costs incurred by a firm are tabulated below. Find the correlation coefficient using Karl Pearson's formula. Quantity producedTotal cost1012020230303154042550510

Answer»

The quantity of goods produced and costs incurred by a firm are tabulated below. Find the correlation coefficient using Karl Pearson's formula.

$\begin{matrix} Quantity produced & Total cost 10 & 120 20 & 230 30 & 315 40 & 425 50 & 510 \end{matrix}$

Discussion

627.	Explain the characteristics of a standardised test.
Answer» Explain the characteristics of a standardised test.

Discussion

628.	Question 2 (ii)The following data on the number of girls (to the nearest ten) per thousand boys in different sections of Indian society is given below.SectionNumber of girls per thousand boysScheduled Caste (SC)940Scheduled Tribe (ST)970Non SC/ST920Backward districts950Non-backward districts920Rural930Urban910(ii) In the classroom discuss, what conclusions can be arrived at from the graph.
Answer» Question 2 (ii) The following data on the number of girls (to the nearest ten) per thousand boys in different sections of Indian society is given below. $\begin{matrix} Section & Number of girls per thousand boys Scheduled Caste (SC) & 940 Scheduled Tribe (ST) & 970 Non SC/ST & 920 Backward districts & 950 Non-backward districts & 920 Rural & 930 Urban & 910 \end{matrix}$ (ii) In the classroom discuss, what conclusions can be arrived at from the graph.

Discussion

629.	Can r lie outside the -1 and 1 range depending on the type of data?
Answer» Can r lie outside the -1 and 1 range depending on the type of data?

Discussion

630.	Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months. Rating688.59710Numberofmonthswiththerating2810785 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 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.

630.

Steven Gerard, arguably one of the most consistent and skilled player in English premier league was given ratings by a Football website. The ratings are given on monthly basis. The following are the ratings for the past 40 months. Rating688.59710Numberofmonthswiththerating2810785 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 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

631.	With reference to the data from GST as per economic survey 2017-18, consider the following statements. 1. There has been a large increase in the number of indirect taxpayers. 2. The distribution of the GST base among the states is closely linked to their Gross State Domestic Product (GSDP), allaying fears of major producing that the shift to the new system would undermine their tax collections.
Answer» With reference to the data from GST as per economic survey 2017-18, consider the following statements. 1. There has been a large increase in the number of indirect taxpayers. 2. The distribution of the GST base among the states is closely linked to their Gross State Domestic Product (GSDP), allaying fears of major producing that the shift to the new system would undermine their tax collections.

631.

With reference to the data from GST as per economic survey 2017-18, consider the following statements. 1. There has been a large increase in the number of indirect taxpayers. 2. The distribution of the GST base among the states is closely linked to their Gross State Domestic Product (GSDP), allaying fears of major producing that the shift to the new system would undermine their tax collections.

Answer»

With reference to the data from GST as per economic survey 2017-18, consider the following statements.

1. There has been a large increase in the number of indirect taxpayers.

2. The distribution of the GST base among the states is closely linked to their Gross State Domestic Product (GSDP), allaying fears of major producing that the shift to the new system would undermine their tax collections.

Discussion

632.	Calculate coefficient of variation from the following data : No. of Goals Scored01234No. of Matches Played279854
Answer» Calculate coefficient of variation from the following data : $\begin{matrix} No. of Goals Scored & 0 & 1 & 2 & 3 & 4 No. of Matches Played & 27 & 9 & 8 & 5 & 4 \end{matrix}$

632.

Calculate coefficient of variation from the following data : No. of Goals Scored01234No. of Matches Played279854

Answer»

Calculate coefficient of variation from the following data :

$\begin{matrix} No. of Goals Scored & 0 & 1 & 2 & 3 & 4 No. of Matches Played & 27 & 9 & 8 & 5 & 4 \end{matrix}$

Discussion

633.	What is coterminal vector subtraction?
Answer» What is coterminal vector subtraction?

Discussion

634.	Which measures of central tendency are affected by extremes?
Answer» Which measures of central tendency are affected by extremes?

Discussion

635.	X and Y are two statistically independent random variables. If X has uniform PDF in the interval [0,2] and Y has uniform PDF in the interval [0,4], then the value of E[XY] will be
Answer» $X$ and $Y$ are two statistically independent random variables. If $X$ has uniform PDF in the interval $[0, 2]$ and $Y$ has uniform PDF in the interval $[0, 4]$ , then the value of $E [X Y]$ will be

Discussion

636.

Calculate weighted mean of the following data by using Direct and Short-cut Methods: Items 81 76 74 58 70 73 Weight 2 3 6 7 3 7

Answer» Calculate weighted mean of the following data by using Direct and Short-cut Methods:

Items	81	76	74	58	70	73
Weight	2	3	6	7	3	7

Discussion

637.

Construct index number of industrial production in the year 2017 from the following data on the basis of 2005's production: Industry Units 2005 2017 Weight Electrical and Electronics Metallurgical Mechanical Mining Textiles Miscellaneous Mill. Nos. Th. Tonnes Th. Tonnes Th. Tonnes Mill. Mtrs. Th. Tonnes 12 22 72 100 60 123 70 37 105 123 130 270 36 12 10 22 8 12

Answer» Construct index number of industrial production in the year 2017 from the following data on the basis of 2005's production:

Industry	Units	2005	2017	Weight
Electrical and Electronics Metallurgical Mechanical Mining Textiles Miscellaneous	Mill. Nos. Th. Tonnes Th. Tonnes Th. Tonnes Mill. Mtrs. Th. Tonnes	12 22 72 100 60 123	70 37 105 123 130 270	36 12 10 22 8 12

Discussion

638.	X is a uniformly distributed random variable that takes values between 0 and 1. The value of E(X4) will be ____.0.2
Answer» X is a uniformly distributed random variable that takes values between 0 and 1. The value of $E (X^{4})$ will be ____. 0.2

Discussion

639.	Find the sum of first n even numbers
Answer» Find the sum of first n even numbers

Discussion

640.

Find out the mean deviation and its coefficient using median of the following data: S. No. 1 2 3 4 5 6 7 8 9 10 11 12 Number of Victims of Accidents 16 21 10 17 8 4 2 1 2 2 2 2

Answer» Find out the mean deviation and its coefficient using median of the following data:

S. No.	1	2	3	4	5	6	7	8	9	10	11	12
Number of Victims of Accidents	16	21	10	17	8	4	2	1	2	2	2	2

Discussion

641.	Identify any personal problem that you or your friends or relatives are facing. Attempt a sociological understanding.
Answer» Identify any personal problem that you or your friends or relatives are facing. Attempt a sociological understanding.

Discussion

642.	34. A and B are two independent events such that P(A union B compliment) equal to 0.8 and P(A) equal to 0.3.The P(B)is
Answer» 34. A and B are two independent events such that P(A union B compliment) equal to 0.8 and P(A) equal to 0.3.The P(B)is

Discussion

643.	An employee currently earns a salary of Rs.15,000 per year and his salary in the base year of 1990 is Rs.3,000 per year. What should be the raise in his salary in order to maintain the same standard of living with time if the CPI today is 500?
Answer» An employee currently earns a salary of Rs.15,000 per year and his salary in the base year of 1990 is Rs.3,000 per year. What should be the raise in his salary in order to maintain the same standard of living with time if the CPI today is 500?

Discussion

644.	Pick out the demonstrative pronoun from the sentence. That is his first authored book on your table.
Answer» Pick out the demonstrative pronoun from the sentence. That is his first authored book on your table.

644.

Pick out the demonstrative pronoun from the sentence. That is his first authored book on your table.

Answer»

Pick out the demonstrative pronoun from the sentence.

That is his first authored book on your table.

Discussion

645.	Question 18The point of the form (a, a) always lies on:A) x-axisB) y-axisC) The line y = xD) The line x + y = 0
Answer» Question 18 The point of the form (a, a) always lies on: A) x-axis B) y-axis C) The line y = x D) The line x + y = 0

Discussion

646.	Find the quartile deviation and coefficient of quartile from the given data Class Interval0−1010−2020−3030−4040−5050−6060−70Frequency28311821364920
Answer» Find the quartile deviation and coefficient of quartile from the given data $\begin{matrix} Class Interval & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 & 50 - 60 & 60 - 70 Frequency & 28 & 31 & 18 & 21 & 36 & 49 & 20 \end{matrix}$

646.

Find the quartile deviation and coefficient of quartile from the given data Class Interval0−1010−2020−3030−4040−5050−6060−70Frequency28311821364920

Answer»

Find the quartile deviation and coefficient of quartile from the given data

$\begin{matrix} Class Interval & 0 - 10 & 10 - 20 & 20 - 30 & 30 - 40 & 40 - 50 & 50 - 60 & 60 - 70 Frequency & 28 & 31 & 18 & 21 & 36 & 49 & 20 \end{matrix}$

Discussion

647.

Weight of 20 students is given in kilograms. Using class interval of 5, make a frequency distribution. 30 45 26 25 42 33 15 35 45 45 45 39 42 40 18 35 41 20 36 48

Answer» Weight of 20 students is given in kilograms. Using class interval of 5, make a frequency distribution.

30	45	26	25	42	33	15	35	45	45
45	39	42	40	18	35	41	20	36	48

Discussion

648.	Find the equations of straight lines which pass through (2,1) and are respectively parallel and perpendicular to the x-axis.
Answer» Find the equations of straight lines which pass through (2,1) and are respectively parallel and perpendicular to the x-axis.

Discussion

649.	When is rank correlation more precise than simple correlation coefficient?
Answer» When is rank correlation more precise than simple correlation coefficient?

Discussion

650.

From the following data, construct a weighted index number for 2011 with 2000 as base year. ItemsWeightPrices2000Prices2011Wheat151015Rice10816Pulses5510Milk424Oil646Sugar736Salt312

Answer»

From the following data, construct a weighted index number for 2011 with 2000 as base year.

$\begin{matrix} Items & Weight & Prices 2000 & Prices 2011 Wheat & 15 & 10 & 15 Rice & 10 & 8 & 16 Pulses & 5 & 5 & 10 Milk & 4 & 2 & 4 Oil & 6 & 4 & 6 Sugar & 7 & 3 & 6 Salt & 3 & 1 & 2 \end{matrix}$

Discussion

Explore topic-wise InterviewSolutions in .

Mention two points to state the importance of Statistics in Economics.

In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A &amp; B are given by two line graphs. In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.

range of the function f(x)={x}^{x} where {X} is fractional part of x,is where x does not belong to z SA-M-198-11

Explain the rule followed by the pattern which would give the number of coloured block in any grid on the pattern shown here?

Students are asked to make National flag 'TIRANGA' on Independence day. As we know flag has three colours, in how many ways our national flag can be made with these three colours? What are the significance of three colours of our National flag?

National Sample Survey (NSS) was set up in ___.

Calculate the number of observations for an accuracy of 5% confidence level of 95% if P=0.25 _____. 4610

What are the main sources of data?

Describe the role of small business in rural India.

The mean deviation from the data 3,10,4,7,10,5:

A person who takes a survey to collect data first-hand from his customer is a/an ___.

Why does rank correlation coefficient differ from Pearsonian correlation coefficient?

In a steady state, temperature of each part of rod is

A∩(B-C)=(A∩ B)-(A∩ C)

Collect the price of five vegetables from your local market every day for a week. Calculate their correlation coefficients. Interpret the result.

For the data : 5, 4, 8, 10, 2, 3, 5, 6, 7, 8, 10, 2, 1, 4, 6, 5, 8, 7, x, 2y, y, the median is 5 and the modes are both 5 and 2y. The value of x2 + y2 is (Consider the data to be discrete)

The mean and the variance of five observations are 4 and 5.20, respectively. If three of observations are 3,4 and 4; then the absolute value of the difference of the other two observations, is

The following figure is a graph of

The following table gives the distribution of the life time of 400 neon lamps: Life timeNumber of lamps(in hours) 1500−2000142000−2500562500−3000603000−3500863500−4000744000−4500624500−500048Find the median life time of a lamp.

Let x1,x2,…,x100 be 100 observations such that 100∑i=1xi=0, ∑1≤i&lt;j≤100|xixj|=80000 and mean deviation from their mean be 5. Then their standard deviation is

If 9 out of 36 people love eating pies, the pie chart would represent them in a ___.

Describe main features of the interview as a research method.

Two zero mean Gaussian random variables X1 and X2 have variances respectively; Their covariance is Cx1x2=3. These variables are linearly transformed to new random variables as follows:σ2x1=4 and σ2x2=9The value of covarience CY1Y2 will be_____Y1=X1−2X2 and Y2=3X1+4X2 -66

The quantity of goods produced and costs incurred by a firm are tabulated below. Find the correlation coefficient using Karl Pearson's formula. Quantity producedTotal cost1012020230303154042550510

Explain the characteristics of a standardised test.

Can r lie outside the -1 and 1 range depending on the type of data?

Calculate coefficient of variation from the following data : No. of Goals Scored01234No. of Matches Played279854

What is coterminal vector subtraction?

Which measures of central tendency are affected by extremes?

X and Y are two statistically independent random variables. If X has uniform PDF in the interval [0,2] and Y has uniform PDF in the interval [0,4], then the value of E[XY] will be

Calculate weighted mean of the following data by using Direct and Short-cut Methods: Items 81 76 74 58 70 73 Weight 2 3 6 7 3 7

X is a uniformly distributed random variable that takes values between 0 and 1. The value of E(X4) will be ____.0.2

Find the sum of first n even numbers

Find out the mean deviation and its coefficient using median of the following data: S. No. 1 2 3 4 5 6 7 8 9 10 11 12 Number of Victims of Accidents 16 21 10 17 8 4 2 1 2 2 2 2

Identify any personal problem that you or your friends or relatives are facing. Attempt a sociological understanding.

34. A and B are two independent events such that P(A union B compliment) equal to 0.8 and P(A) equal to 0.3.The P(B)is

An employee currently earns a salary of Rs.15,000 per year and his salary in the base year of 1990 is Rs.3,000 per year. What should be the raise in his salary in order to maintain the same standard of living with time if the CPI today is 500?

Pick out the demonstrative pronoun from the sentence. That is his first authored book on your table.

Question 18The point of the form (a, a) always lies on:A) x-axisB) y-axisC) The line y = xD) ​​​​​​​The line x + y = 0​​​​​​​

Find the quartile deviation and coefficient of quartile from the given data Class Interval0−1010−2020−3030−4040−5050−6060−70Frequency28311821364920

Weight of 20 students is given in kilograms. Using class interval of 5, make a frequency distribution. 30 45 26 25 42 33 15 35 45 45 45 39 42 40 18 35 41 20 36 48

Find the equations of straight lines which pass through (2,1) and are respectively parallel and perpendicular to the x-axis.

When is rank correlation more precise than simple correlation coefficient?

From the following data, construct a weighted index number for 2011 with 2000 as base year. ItemsWeightPrices2000Prices2011Wheat151015Rice10816Pulses5510Milk424Oil646Sugar736Salt312

In a T-20 cricket match (which is played for 20 overs), runs scored by the two teams A & B are given by two line graphs. In how many instances during the entire match a team scored the same runs in the same over as compared to the other team.

Let x1,x2,…,x100 be 100 observations such that 100∑i=1xi=0, ∑1≤i<j≤100|xixj|=80000 and mean deviation from their mean be 5. Then their standard deviation is

Question 18The point of the form (a, a) always lies on:A) x-axisB) y-axisC) The line y = xD) The line x + y = 0