Normally Distributed Observations Such as a Person's Weight, Height or Shoe

Normally distributed observations such as a person's weight, height or shoe size occur quite
Frequently in nature. Business people who are aware of this use it to their advantage. A purchasing
Agent for a college bookstore buying 300 golf shirts used the normal curve to decide on the order
Quantities for the various sizes. If men's average shirt size is 15.5 with a standard deviation of .50,
How many shirts should be ordered in sizes over 16.5?

A) 7
B) 8
C) 9
D) 10
E) 6