Q3 of 23 Page 15

Find the mean, variance and standard deviation for the following data:

6, 7, 10, 12, 13, 4, 8, 12

Explanation: Here, Mean




And, n=8


Variance (X) =



Variance = 9.25


Standard deviation =



Standard deviation = 3.04

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The coefficient of variation of two distribution are 60% and 70%, and their standard deviations are 21 and 16 respectively. What is their arithmetic means?

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