It is known that 65% of Empire plan customers order their prescriptions via mail-order at least...
It is known that 65% of Empire plan customers order their prescriptions via mail-order at least once a year. Suppose we randomly select 6 customers.
What is the probability that at most one has mail-ordered in the last year?
Homework Answers
Solution
Given that ,
p = 0.65
n = 6
Using binomial probability formula ,
P(X = x) = (n C x) * px * (1 - p)n - x
P(X 
1) = P(X = 0) + P(X = 1)
= (6 C 0 ) * 0.650 * (0.35)0 + (6 C 1) * 0.651 * (0.35)5
= 0.0223
Probability = 0.0223
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