Ive missed it 3 times. The mean height of woman in a country (ages 20-29) is 63.5 inches. A random sample 55 women in this age group is selected.

Please help me figure out how to do this problem. Ive missed it 3 times. The mean height of woman in a country (ages 20-29) is 63.5 inches. A random sample 55 women in this age group is selected. What is the probability that the mean height is greater than 64 inches? Assume standard deviation = 2.53.