Asked by aso

the average number of passengers on a subway car is 60. If the number of passengers on a car has normal distribution with a standard deviation of 20, approximately what the percent of subway cars carry more than 80 passengers?
Answered by Reiny
your data is perfectly suited for this webpage, which replaces the tables you probably have at the back of your text
I got 15.87%

http://davidmlane.com/hyperstat/z_table.html
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