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Coefficients of variation of two distributions are 50 and 60,
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Coefficients of variation of two distributions are 50 and 60, and their arithmetic means are 30 and 25, respectively. Difference of their standard deviations is

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Question 1
Compute the mean of the following data,  using direct method:

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Question 2
What is the standard deviation of the following data ?

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Question 3
If the median of the distribution given below is , find the values of and .

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Question 4
Algebraic sum of all the deviation from 30 of 50 observations is 50. Find their mean (A) (B) (C) (D)

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Coefficients of variation of two distributions are 50 and 60, and their arithmetic means are 30 and 25, respectively. Difference of their standard deviations is