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Let `x_1, x_2, ...... ,x_n` be values taken by a variable `X` `a n d` `y_1, y_2,.......... ,y_n` be the values taken by a variable `Y` such that `y_i=a x_i+b` ,i=1,2,3....` Then, (a) `Var.(Y)=`a^2Var.(X)` (b) `Var.(X)=a^2Var.(Y)` (c) `Var.(X)=Var.(X)+b` (d) none of these

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RD SHARMA ENGLISH-STATISTICS-All Questions
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  2. An analysis of monthly wages paid to the works of two firms A and B ...

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  3. Let x1, x2, ...... ,xn be values taken by a variable X a n d y1, y2,.....

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  4. The algebraic sum of deviations of 10 observations measured from 16 is...

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  5. Calculate the mean deviation about median from the following data: 340...

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  6. For a group of 200 candidates the mean and S.D. were found to be 40 an...

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  7. Find the mean deviation from the mean for the data: 6,7,10,12,13,4,8,2...

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  8. The scores of a batsman in ten innings are : 38,70,48,34,42,55,63,46,5...

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  9. Calculate the mean deviation about the mean of the set of first n natu...

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  10. Calculate the mean deviation about the mean of the set of first n natu...

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  11. Find the variance and standard deviation of the following data 5,12,3,...

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  12. Compute the variance and standard deviation of the following observa...

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  13. The number of telephone calls received at an exchange in 245 successiv...

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  14. Calculate mean deviation from the median for the following distribu...

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  15. The mean deviation for n observations x1, x2, ......... , xn from th...

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  16. Let x1,""x2,"". . . . . . ,""xn be n observations, and let bar x be t...

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  17. The scores of a batsman in 10 matches were as follows: 38,70,48,34,...

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  18. The mean and variance of 7 observation is 8 and 16. If five of the obs...

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  19. If for a sample of size 60, we have the following information sumxi^2=...

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  20. The mean and standard deviation of 20 observations are found to be ...

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