SOLUTION: If 80% of job applicants are able to pass a computer literacy test, find the mean, variance, and standard deviation of the number of people who pass the examination in a sample

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Question 1161408: If 80% of job applicants are
able to pass a computer literacy test, find the mean,
variance, and standard deviation of the number of
people who pass the examination in a sample of
150 applicants

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

n=150
p=80%=0.80
q=1-p=80-20%=0.20
mean => mu=+np+=+150%2A0.80=120
standard deviation
delta=+sqrt%28npq%29+=+sqrt%28120%2A0.2%29=+sqrt%2824%29=4.899
variance+=+%28delta%29%5E2=%28sqrt%2824%29%29%5E2=24