# statistics

The distribution of grades of 50 students in a certain subject is normally distributed with a mean of 86 and a standard deviation of 12. 6. 7. If the passing grade is 75, how many failed in the subject?

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1. standard deviation of 12. 6. 7 <-----????
anyway
go here:
http://davidmlane.com/hyperstat/z_table.html

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