There are 30 white balls and 10 red ball...

There are 30 white balls and 10 red balls in bag. 16 balls are drawn with replacement from the bag. If `X` be the number of white balls drawn then the value of `("mean"(X))/("standard deviation"(X))` is equal to (A) `4sqrt3` (B) `2sqrt3` (C) `3sqrt3` (D) `3sqrt2`

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