The mean and variance of a Bernoille random variable are given as
A)cannot be calculated
B)np and np(1-p)
C)p and
D)p and (1- p)

Name: The mean and variance of a Bernoille random variable are given as A)cannot be calculated B)np and np(1-p) C)p and D)p and (1- p)
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Question

The mean and variance of a Bernoille random variable are given as
A)cannot be calculated 
B)np and np(1-p) 
C)p and 
D)p and (1- p)

Quizplus · Accepted Answer

The mean of a Bernoulli random variable is p, which is always true. The variance of a Bernoulli random variable is p(1-p), which simplifies to (1-p)p or (p-p^2), which is option D.

The Mean and Variance of a Bernoille Random Variable Are