Let x1, x2, ...,xn be n observations and X be their arithmetic mean. The standard deviation is given by(a) ∑i=1nxi-X2 (b) 1n∑i=1nxi-X2 (c) 1n∑i=1nxi-X2 (d) 1n∑i=1nxi2-X2

Let x1, x2, ...,xn be n observations and X be their arithmetic mean. T

1.	Let x1, x2, ...,xn be n observations and X be their arithmetic mean. The standard deviation is given by(a) ∑i=1nxi-X2 (b) 1n∑i=1nxi-X2 (c) 1n∑i=1nxi-X2 (d) 1n∑i=1nxi2-X2
Answer» Let $x_{1}, x_{2}, . . ., x_{n}$ be n observations and $X$ be their arithmetic mean. The standard deviation is given by (a) $\sum_{i = 1}^{n} {(x_{i} - X)}^{2}$ (b) $\frac{1}{n} \sum_{i = 1}^{n} {(x_{i} - X)}^{2}$ (c) $\sqrt{\frac{1}{n} \sum_{i = 1}^{n} {(x_{i} - X)}^{2}}$ (d) $\sqrt{\frac{1}{n} \sum_{i = 1}^{n} x_{i}^{2} - X^{2}}$

Discussion

No Comment Found

Related InterviewSolutions

A ladder of length 6 metres makes an angle of 45° with the floor while leaning against one wall of a room. If the foot of the ladder is kept fixed on the floor and it is made to lean against the opposite wall of the room, it makes an angle of 60° with the floor. Find the distance between two walls of the room. [CBSE 2011]
12. The height of a building is one-third of the height of telephone exchange tower standing on it . If the angle of elevation of the top of the building when seen from a point on the ground is 30^° , then find the tangent of angle of elevation of the top of the telephone exchange tower when seen from the same point .
Question 5 In the following question out of the four options only one is correct, write the correct answer: If 5x3−4=2x5, then the numerical value of 2x-7 is: (a) 1913 (b) −1319 (c) 0 (d) 1319
In figure displayed below, if TP and TQ are the two tangents to a circle with centre O so that ∠POQ=110∘, then ∠PTQ is equal to
In the given figure, if ∠OAB=40∘, then ∠ACB = ___.
1. From a point 100 metre above a lake the angle of elevation of a stationary helicopter is 30^° and the angle of depression of reflection of the helicopter in the lake is 60 degree. Find the height of the helicopter above the lake.
If A and B are any two events having P(A∪B)=12 and P(A)=23 then probability of A ∩ B is (a) 12 (b) 23 (c) 16 (d) 13
For the given linear equation x−2y=1, match the different x values with their corresponding y values.
Let A be a square matrix of order n such that det(A)=10 and det(2A)2=40. Then the order of A is[1 mark]
A tangent is a secant with which of the following properties?

Let x1, x2, ...,xn be n observations and X be their arithmetic mean. The standard deviation is given by(a) ∑i=1nxi-X2 (b) 1n∑i=1nxi-X2 (c) 1n∑i=1nxi-X2 (d) 1n∑i=1nxi2-X2

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment