The mean of the commute time to work for a resident of a certain city is 27.3 minutes. Assume that the standard deviation of the commute time is 6.6 minutes.

Question

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

 

Answer 1

Lynn,

          68.27% of the commute times are within 2 standard deviation of the mean. It's a property of the normal (bell curve) distribution.

Jim