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Standard deviation of first 'n' natural ...

Standard deviation of first 'n' natural numbers is

A

`(n+1)/(2)`

B

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

C

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

D

n

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The correct Answer is:
C
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AAKASH SERIES-MEASURES OF DISPERSION (STATISTICS)-Exercise - I
  1. Coefficient of variation of a distribution is 60 and its standard devi...

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  2. If the mean of 10 observations is 50 and the sum of the squares of the...

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  3. Standard deviation of first 'n' natural numbers is

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  4. The variance of the first 50 even natural numbers is

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  5. The median and S.D. of a distribution are 20 and 4 respetively. If eah...

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  6. The standard deviation of 26, 27, 31, 32, 35 is

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  7. The standard deviation of a, a+d, a + 2d,….a + 2nd is

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  8. The variance of first 10 multiples of 3 is

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  9. For a group of 50 male workers, the mean and S.D. of their daily wages...

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  10. If standard deviation of 1,2,3,4,….,10 is sigma then standard deviatio...

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  11. The standard deviation of a variable x is sigma. The standard deviatio...

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  12. The variance of observation x(1), x(2),x(3),…,x(n) is sigma^(2) then t...

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  13. The standard deviations of two sets containing 10 and 20 members are 2...

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  14. The standard deviation of the observations 22, 26, 28, 20, 24, 30 is

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  15. The mean of five observations is 4 and their variance is 5.2. If three...

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  16. Which of the following is correct relations a symmetrical distribution...

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  17. One of the methods of determining mode is

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  18. Which of the following is correct for data -1, 0, 1,2,3,5,5,6,8,10,11

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  19. If m is mean of distribution, then sum(x(i) - m) is equal to

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  20. Consider the following statements : (i) Mode can be computed from hi...

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