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The mean of 100 observations is 50 and t...

The mean of 100 observations is 50 and their standard deviation is 5. The sum of all squares of all the obsrervations is :

A

50000

B

250000

C

252500

D

255000

Text Solution

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The correct Answer is:
C
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HIMALAYA PUBLICATION-STATISTICS MEASURE OF DIPERSION-QUESTION BANK
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  3. The mean of 100 observations is 50 and their standard deviation is 5. ...

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  4. Let a, b, c, d, e be the observations with mean m and standard deviati...

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  5. Let x(1), x(2), ….., x(n) be n observations. Let w(i) = lx(i) + k for ...

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  6. Let x(1), x(2), x(3), x(4), x(5) be the observations with mean m and s...

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  7. Standard deviations for first 10 natural numbers is :

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  8. Consider the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. If 1 is added to e...

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  9. The following information relates to a sample of size 60 : sum x^(2) =...

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  10. Coefficients of variation of two distributions are 50 and 60, and thei...

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  11. The standard deviation of some temperature data in overset C is 5. If...

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  12. In an experiment with 15 observations on x, the following results were...

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  13. In a series of 2n observations, half of them equal to a and remaining ...

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  14. Suppose a population A has 100 observations 101, 102, …., 200 and anot...

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  15. If the mean deviation of the numbers : 1, 1 + d, 1 + 2d, ….., 1 + 100d...

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  18. The measure of dispersion is

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  19. The S.D. of 5 scores 1, 2, 3, 4, 5 is :

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  20. The variance of the first n natural numbers is :

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