Question 899355
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) = {{{sum((matrix(2,1,25,x))(0.4^x)(0.6^(25-x)),x=15,25)}}} = {{{highlight(0.0344)}}}