The Monthly Electrical Utility Bills of All Customers for the Far

Multiple Choice

The monthly electrical utility bills of all customers for the Far East Power and Light Company are known to be distributed as a normal distribution with mean equal to $87.00 a month and standard deviation of $36.00. If a statistical sample of n = 100 customers is selected at random, what is the probability that the mean bill for those sampled will exceed $75.00?

A) -0.33
B) Approximately 0.63
C) About 1.00
D) 3.33