ProbabilityHard
Question
The mean and the variance of a binomial distribution are 4 and 2 respectively. Then the probability of 2 successes is
Options
A.
B.
C.
D.
Solution
Given that n p = 4, n p q = 2 ⇒ q = 1/2 ⇒ p = 1/2 , n = 8 ⇒ p(x = 2) = 8C2 
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