I need some help with this statistics quesiton?

In a murder trial in Los Angeles, a shoe expert stated that the range of heights of men with a size 12 shoe is 73 inches to 77 inches. Suppose the heights of all men wearing size 12 shoes are normally distributed with a mean of 75.5 inches and a standard deviation of 1 inch. What is the probability that a randomly selected man who wears a size 12 shoe (Round answers to four decimal places.)