ProbabilityEasy
Question
The mean and variance of a random variable having a binomial distribution are 4 and 2 respectively, then P (X = 1) is
Options
A.
B.
C.
D.
Solution
np = 4
npq = 2
q =
, p =
n = 8
p (x = 1) = 8C1
=
Hence, (A) is the correct answer.
npq = 2
q =
, p = n = 8
p (x = 1) = 8C1
=
Hence, (A) is the correct answer.
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