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 40, with a standard deviation of 35. A pollster draws a sample of 48 people to interview. What is the probability that the sample mean income is between 34 and 45 (thousands of dollars) ?

A) 0.2781
B) 0.1611
C) 0.8389
D) 0.7219