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Find the Mean and S.D. of first n natura...

Find the Mean and S.D. of first n natural numbers

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The correct Answer is:
Mean `=(n+1)/(2)`, S.D. `=sqrt((1)/(12)(n^(2)-1))`
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CHHAYA PUBLICATION-MEASURES OF DISPERSION -Exercise 3 Very Short answer type
  1. Find the mean deviation about the A.M. of each of the following distri...

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  2. Calculate the value of M.D. about the median of each of the following ...

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  3. Calculate the value of M.D. about the median of each of the following ...

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  4. Calculate the value of M.D. about the median of each of the following ...

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  5. Calculate the value of M.D. about the median of each of the following ...

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  6. Find the coefficuent of mean deviation (i) about mean (ii) about med...

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  7. From the following array, find out the M.D. : 7,9,16,24,26,31,39

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  8. Calculate the mean deviation about the A.M. of the following distribut...

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  9. Find the value of S.D. of each of the following distributions : 4,5,...

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  10. Find the value of S.D. of each of the following distributions : 4,8,...

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  11. Find the value of S.D. of each of the following distributions : 1,2,...

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  12. Find the Mean and S.D. of first n natural numbers

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  13. The S.D. of the first n odd integers is sqrt(85) , find n.

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  14. The S.D. calculated from a set of 32 observations is 5 . If the sum of...

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  15. The standard deviation of a set of 30 items is 9.5 Find the standard d...

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  16. The standard deviation of a set of 50 items is 8. Find the standard de...

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  17. Prove that the standard deviation calculated from two values x(1) and ...

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  18. Find the mean if coefficient of variation =5% and variance = 4.

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  19. Find the coefficient of variation if the sum of squares of the deviati...

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  20. If the co-efficient variance and standerd deviation of two frequency d...

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