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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)`.

Text Solution

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The correct Answer is:
(i) x = 0,1,2,..,8
(ii) `18C_(3)(1/3)^(3)(2/3)^(15)`
(iii) `1-20/3(2/3)^(17)`
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