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The variance of the first n natural numb...

The variance of the first n natural numbers is

A

`(n^(2)+1)/(12)`

B

`(n^(2)-1)/(12)`

C

`(n(n+1)(2n+1))/(6)`

D

none of these

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The correct Answer is:
B
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ML KHANNA-MEASURES OF CENTRAL TENDENCY -Problem Set (1) (Measures of Disperation)
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  11. Karl Pearson's coefficient of skewness of a distribution is 0*32. Its ...

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  12. Which of the following are dimensionless

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  13. The variance of the first n natural numbers is

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  14. An incomplete frequency distribution is given below Median value ...

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  16. If r be the range and S={(1)/(n-1)Sigma(i)(x(i)-bar(x))^(2)}^(1//2) b...

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  17. The score of two golfers for 10 rounds each are A : 58,59,60,54,65,6...

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  18. If the variable takes the values 0,1,2, . . .,n with frequencies propo...

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  19. A student obtained the mean and s.d. of the observations as 40 and 5*1...

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  20. The S.D. is not less than the mean deviation. True/False

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