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The mean and standard deviation of marks...

The mean and standard deviation of marks obtained by sections A and B are :
`{:(,"Series A" , "Series B") , ("Mean" , 20 , 21), (S.D. , 6 , 9):}`
Which series shows lower variation ?

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The correct Answer is:
`V_(A) = 30%, V_(B) = 42.86%`
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