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Test: Variance And Standard Deviation - Question 1

Mean of the squares of the deviations from mean is called the:

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Test: Variance And Standard Deviation - Question 3

The mean weight of a group of 10 items is 28 and that of another group of n items is 35.The mean of combined group of 10 + n items is found to be 30. The value of n is

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Test: Variance And Standard Deviation - Question 4

A batsman scores runs in 10 innings as 38,70,48,34,42,55,63,46,54 and 44 , then the mean score is

Test: Variance And Standard Deviation - Question 5

For a given data, the standard deviation is 20.If 3 is added to each observation , what is the new variance of the resulting observations?

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Test: Variance And Standard Deviation - Question 6

For a given data, the variance is 15. If each observation is multiplied by 2, what is the new variance of the resulting observations?

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Test: Variance And Standard Deviation - Question 7

The following values are calculated in respect of marks of the students of sections A and B of Class X:

The marks of which section have more variability?

Test: Variance And Standard Deviation - Question 8

If is large, there is a ______ degree of dispersion.

Test: Variance And Standard Deviation - Question 9

The standard deviation for the following data:

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Test: Variance And Standard Deviation - Question 10

The standard deviation of first 10 multiples of 4 is:

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