The Heights of 18-Year-Old Men Are Approximately Normally Distributed with Mean

Multiple Choice

The heights of 18-year-old men are approximately normally distributed with mean 68 inches and standard deviation 3 inches. What is the probability that the average height of a sample of ten 18-year-old men will be between 67 and 68 inches? $$\bar { x }$$

A) 0.3531
B) 0.6469
C) 0.1469
D) 0.7062
E) 0.3961