Posted by **Michael** on Sunday, November 13, 2011 at 8:27am.

1. The average commute time via train from the Chicago O'Hare Airport to downtown is 60 minutes with a standard deviation of 15 minutes. Assume that the commute times are normally distributed. What proportion of commutes would be:

a. longer than 80 minutes?

b. less than 50 minutes?

c. between 45 and 75 minutes?

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