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If each of the observation x1,x2,………..xn...

If each of the observation x1,x2,………..xn is increased by 'a',where a is a negative or positive number,shows that the variance remains unchanged.

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V PUBLICATION-STATISTICS-QUESTION BANK
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  2. Find the mean and standard deviation using short-cut method

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  3. Find the mean and variance for the following frequency distribution.

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  4. Find the mean, variance and standard deviation using short cut method.

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  5. Two plants A and B of a factory show following results about the numbe...

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  6. Coefficient of variation of two distributions are 60 and 70 and their ...

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  7. The following values are calculated in respect of heights and weights ...

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  8. The following is the rècord of goals scored by team '(A)' in a footbal...

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  9. The sum and squares corresponding to length x(in cm) and y(in gm) of 5...

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  10. The variance of 20 observations is '5 .' If each observation is multip...

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  11. The mean of 5 observations is 4.4 and their variance is 8.24.If three ...

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  12. If each of the observation x1,x2,………..xn is increased by 'a',where a...

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  13. The mean and standard deviation of 100 observations were calculated as...

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  14. The mean and variance of 7 observations are 8 and 16 respectively. If ...

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  15. The mean and standard deviation of six observations are 8 and 4, respe...

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  16. The mean and standard deviation of marks obtained by. 50 students of a...

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  17. Calculate the mean deviation about median from the following data 340...

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  18. Find the mean deviation about the mean for the following data: 6,7,10,...

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  19. Find the variance and standard deviation for the following data 65,68...

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  20. If each of the observation x1,x2,………..xn is increased by 'a',where a...

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