The Average Sales Per Customer at a Home Improvement Store

Multiple Choice

The average sales per customer at a home improvement store during the past year is $75 with a standard deviation of $12.The probability that the average sales per customer from a sample of 36 customers,taken at random from this population,exceeds $78 is:

A) 0.4332.
B) 0.0668.
C) 0.0987.
D) 0.9013.
E) 0.5000