﻿ Let xi1 ≤ i ≤ 10 be ten observation of a random variable X. If ∑i = 110xi - p = 3and  ∑i = 110xi - p2 = 9 where 0 ≠ p ∈ R, then the standard deviation of these observations is  | Statistics

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41.$\frac{4}{5}$ $\sqrt{\frac{3}{5}}$ $\frac{9}{10}$ $\frac{7}{10}$

C.

$\frac{9}{10}$

42.

The mean and variance of 8 observations are 10 and 13.5 respectively. If 6 of these observations are 5, 7, 10, 12, 14, 15, then the absolute difference of the remaining two observations is :

• 9

• 5

• 3

• 7

43.

If the variance of the following frequency distribution :

Class :      10-20 20-30 30-40

Frequency : 2        x        2

is 50, then x is equal to ....

Multiple Choice Questions

44.

If the mean and the standard deviation of the data 3, 5, 7, a, b are 5 and 2 respectively, then a and b are the roots of the equation :

• x2 - 20x + 18 = 0

• 2x2 - 20x + 19 = 0

• x2 - 10x + 19 = 0

• x2 - 10x + 18 = 0