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Two distributions A and B have the same mean. If their coefficients of variation are 6 and 2 respectively and `sigma _(A),sigma_(B)` are their standard deviations,then

A

`sigma_(A)=3sigma_(B)`

B

`3sigma_(A)=sigma_(B)`

C

`sigma_(A)=2sigma_(B)`

D

`2sigma_(A) =sigma_(B)`

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A
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