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Mean and variance of a binomial distribution are 18 and 12 respectively. The value of $n$ is:
A27
B36
C54
D18
Answer & Solution
Correct answer: C. 54
$np = 18, npq = 12$ ⇒ $q = 12/18 = 2/3, p = 1/3$. $n = np/p = 18/(1/3) = 54$.
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