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The mean and the variance of a binomial distribution are 4 and 2 respectively.

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The mean and the variance of a binomial distribution are 4 and 2 respectively. Then the probability of 2 successes is:

(a) 128/256 

(b) 219/256

(c) 37/256 

(d) 28/256.

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(d) : Given np = 4 and npq = 2

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