SOLUTION: It is known that 20% of all the residents that take the FL DL test for the first time fail it. Suppose that 15 people on a given day are taking the test for the first time. What is
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Question 426480: It is known that 20% of all the residents that take the FL DL test for the first time fail it. Suppose that 15 people on a given day are taking the test for the first time. What is the probability that exactly 5 people fail it? At least one person fails the test?
Binomial Distibution
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
nCr=combination of n things taken r at a time. Find the coefficient for a certain binomial expansion.
p=.8, f=.2
1-.8^15=.9648 probability that at least one person fails the test.
.
15C5*f^5p^10
=3003*f^5p^10
=.1032 probability that exactly 5 people fail.
.
Ed
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