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The mean and standard deviation of a bi...

The mean and standard deviation of a binomial variate X are respectively 6 and 2. Find (i) the probability mass function (ii) P(X=3) (iii) `P(X ge 2)`.

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The correct Answer is:
`((18)/(x))((1)/(3))^(x)((2)/(3))^(18-x)` (ii) `((18)/(3))((1)/(3))^(3)((2)/(3))^(15)` (iii) `1-(20)/(3)((2)/(3))^(17)`
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