In a Recent Year, the Average Marathon Time for Women

Multiple Choice

In a recent year, the average marathon time for women in the US was 5 hours and 6 minutes (Source: Marathonguide.com) .Suppose that marathon times are normally distributed around this average with a standard deviation of 50 minutes.What marathon time must a woman achieve in order to be among the fastest 10% of marathon runners?

A) 3 hours and 26 minutes or less
B) 4 hours and 2 minutes or less
C) 4 hours and 38 minutes or less
D) 6 hours and 10 minutes or less