Statistics Test...

For $$X \rightarrow B (n, p), \,$$ if $$\, n = 25, E (x) = 10$$ , then S.D. $$(x) = $$

The sum of squares of deviations for $$10$$ observations taken from mean $$50$$ is $$250 $$. Then Co-efficient of variation is

If the standard deviation of the numbers $$2,3,a$$ and $$11$$ is $$3.5,$$ then which of the following is true?

Coefficient of range $$5, 2, 3, 4, 6, 8, 10$$ is?

Find variance of the following data.

Range of data $$7, 8, 2, 1, 3, 13, 18$$ is?

Suppose a population $$A$$ has $$100$$ observations $$101,102,........,200$$ and another population $$B$$ has $$100$$ observations $$151,152......,250 $$. If $$V_{A}and V_{B}$$ represent the variences of the two populations respectively, then $$V_{A}/ V_{B}$$ is

Mean deviation of $$7,10,10,15,10,8,8,7,3,2,10$$ through mean is

Find the standard deviation of 10 observation 111,211,311,....1011.

The two observations $$A$$ & $$B$$ are given by $$100, 101, ........149$$ and $$200, 201, .......,249$$ with $$V_{A}$$ and $$V_{B}$$ are variances of $$A$$ and $$B$$ than $$V_{A}$$ is equal to :