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(Choose 1 answer)
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 dollars a month and standard deviation of 36 dollars.If a statistical sample of n = 100 customers is selected at random, what is the probability that the sample mean bill for those sampled will exceed 75 dollars?
Let P(Z < -3.33) ≈ 0, P(Z-0.33) = 0.37 and P(Z < 0.63) = 0.73.
A. 0.63
B. None of them.
C. Approximately 1.00
D. -0.33
E. None of the other choices is correct
