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CBSE XI
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Q)
Coefficient of variance of two distributions are 50 and 60 , and their arithmetic means are 30 and 25 respectively. Difference of their standard deviation is:
$\begin{array}{1 1}(A)\; 0 \\(B)\;1 \\(C)\;1.5 \\(D)\;2.5 \end{array} $
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