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The mean and S.D. of income of 50 men ar...

The mean and S.D. of income of 50 men are Rs. 3200 and Rs. 525 respectively. The same for 40 women are Rs. 2,850 and Rs. 460 respectively. Find the S.D. of income for the combined group.

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The correct Answer is:
Rs. 526.70
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CHHAYA PUBLICATION-MEASURES OF DISPERSION -Exercise 3 (Long answer type questions)
  1. Two samples of sizes 60 and 90 have 52 and 48 as the respective A.Ms. ...

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  2. Calculate the A.M. and the mean deviation thereform, from the followin...

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  3. From the following data determine in which factory X or Y, there is gr...

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  4. An analysis of weekly wages (in Rs.) paid to workers in two firms A an...

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  5. Two distributions have the same mean Rs. 7500 and standard deviations ...

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  6. In two firms X and Y engaged in the same industry, the average monthly...

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  7. Two batsmen A and B made the following scores in a series of criket ma...

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  8. From the following data determine in which firm, A or B there is grea...

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  9. In two factories A and B engaged in the same industry in an area, the ...

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  10. From the data given below, state with reason which series is more vari...

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  11. Find the coefficient of variation of the following data :

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  12. Find the variance and coefficient of variation of the following freque...

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  13. Calculate the variance of the following distribution (correct upto 3 p...

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  14. Find the semi-interquartile range for the following distribution : ...

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  15. Calculate the appropriate measure of dispersion from the following dat...

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  16. The mean and variance of the six values of a variate are 8 and 8(2)/(3...

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

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  18. The mean and S.D. of income of 50 men are Rs. 3200 and Rs. 525 respect...

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  19. From some financial statistics, it is found that the monthly average e...

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  20. The mean and the standard deviation of the following frequency distrib...

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