Commuting to Work The mean of the commute time to work for a resident of a certain city is 28.8 minutes. Assume that the standard deviation of the commute time is 7.1 minutes to complete parts (a) through (c).

(a) What minimum percentage of commuters in the city has a commute time within 2 standard deviations of the mean?

(b) What minimum percentage of commuters in the city has a commute time within 2.5 standard deviations of the mean?

What are the commute times within 2.5 standard deviations of the mean?

(c) What is the minimum percentage of commuters who have commute times between 7.5 minutes and 50.1 minutes?