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August 1, 2015

Homework Help: stat

Posted by des on Friday, October 14, 2011 at 11:21pm.

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:

longer than 80 minutes?
less than 50 minutes?
between 45 and 75 minutes?

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