SOLUTION: In a recent study, it was found that 40% of customers are unsatisfied with their bank. In a sample of 25 customers, what is the probability of finding at least 15 unsatisfied custo

Question 899355: In a recent study, it was found that 40% of customers are unsatisfied with their bank. In a sample of 25 customers, what is the probability of finding at least 15 unsatisfied customers?
Answer by reviewermath(1029) (Show Source): You can put this solution on YOUR website!
Q:
In a recent study, it was found that 40% of customers are unsatisfied with their bank. In a sample of 25 customers, what is the probability of finding at least 15 unsatisfied customers?
A:
Let X = number of unsatisfied customers in a sample of 25 customers
X ~ Binomial (n = 25, p = 0.4)
P(X ≥ 15) = =
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