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If for a sample of size 60, we have the following information `sumxi2=18000a n dsumxi=960` , then the variance is 6.63 (b) 16 (c) 22 (d) 44

A

6.63

B

16

C

22

D

44

Text Solution

Verified by Experts

The correct Answer is:
D
Variance `=(sum x_(i)^(2))/(n)-((sum x_(i))/(n))^(2)`
`=(18000)/(60)-((960)/(60))^(2)=300-256=44`
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CENGAGE-STATISTICS-Exercise (Single)
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  4. Variance of the data 2,4,6,8,10 is

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  5. If the standard deviation of 0,1,2,3...9 is K, then the standard devia...

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  7. The mean and S.D of 1, 2, 3, 4, 5, 6 is

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  8. The standard deviation of 25 numbers is 40. If each of the numbers in ...

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  9. Consider any set of observations x(1),x(2),x(3),..,x(101). It is given...

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  10. For (2n+1) observations x(1), x(2),-x(2),..,x(n),-x(n) and 0, where al...

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  11. Let r be the range and S^(2)=(1)/(n-1) sum(i=1)^(n) (x(i)-overline(x))...

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  12. The standard deviation of variate xi is σ. Then standard deviation of ...

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  13. The standard deviation of data 6,5,9,13,12,8 and 10 is

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  14. If the mean of 100 observations is 50 and their standard deviations is...

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  15. The standard deviation of first 10 natural numbers is 8.25 (b) 6.5 (c)...

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

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  17. Consider the first 10 positve integers .If we multiply each number by ...

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  18. If for a sample of size 60, we have the following information sumxi2=1...

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  19. The standard deviation of some temperature data in .^(@)C is 5 .If the...

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  20. What is the standard deviation of the following data ? {:("Measureme...

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