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If for a binomial distribution the mean ...

If for a binomial distribution the mean is 6 and the standdard deviation is `sqrt2`, then P(X=r)=

A

`.^(9)C_(r)(2//3)^(r)(1//3)^(9-r)`

B

`.^(9)C_(r)(1//3)^(r)(2//3)^(9-r)`

C

`.^(12)C_(r)(2//3)^(r)(1//3)^(12-r)`

D

`.^(12)C_(r)(1//3)^(r)(2//3)^(9-r)`

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The correct Answer is:
A
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