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Coefficient of variation of two distributions are 60% and 70% and their standard deviations are 21 and 16 respectively. What are their arithmetic means?

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RD SHARMA ENGLISH-STATISTICS-All Questions
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  14. Find the coefficient of variation for the following data: Size (in ...

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  15. The variance of first n natural number is:

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  16. If the sum of the squares of deviations for 10 observations taken from...

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  17. If x1, x2, ,\ xn are n values of a variable X\ a n d\ y1, y2, ......,...

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  18. In a series of 20 observations, 10 observation each equal to k and eac...

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