The coefficient of variation of two series are \( 60 \% \) and \( 7...

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The coefficient of variation of two series are \( 60 \% \) and \( 70 \% \) if their standard deviation are 21 and 14 , then find ratio of their AMs
\( \mathrm{P} \)
(1) \( \frac{6}{7} \)
(2) \( \frac{2}{3} \)
(3) \( \frac{4}{7} \)
(4) \( \frac{7}{4} \)
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