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A sample of 35 observations has the mean...

A sample of 35 observations has the means 80 and SD. As 4. A second sample of 65 observations from the same population has mean 70 and S.D.3. The S.D. of the combined sample is -

A

`5*85`

B

`37*2`

C

`5*58`

D

none of these

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The correct Answer is:
A
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ML KHANNA-MEASURES OF CENTRAL TENDENCY -Problem Set (1) (Measures of Disperation)
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  6. A sample of 35 observations has the means 80 and SD. As 4. A second sa...

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  7. The first of the two samples have 100 items with mean 15 and S.D.3. If...

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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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  15. Mean deviation about the mean bar(x) of the variate x is (2)/(N)[ba...

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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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