The Mean Annual Income for People in a Certain City

The mean annual income for people in a certain city (in thousands of dollars) is 38, with a standard deviation of 31. A pollster draws a sample of 43 people to interview. Find the 68th percentile of the sample mean.

A) 37.7 thousand dollars
B) 38.7 thousand dollars
C) 40.2 thousand dollars
D) 42.3 thousand dollars