Statistics problem 

The scores on a biology exam were normally distributed with a mean of $71$ and a standard deviation of $9$. A failing grade on the exam was anything $2$ or more standard deviations below the mean. What was the cutoff for a failing​ score? Approximately what percentage of the students​ failed?

Statistics Normal Distribution Word Problem
Mona Vinci Mona Vinci
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Ering Ering
93
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