A placement exam is given to all students entering a certain college. The scores are normally distributed w/ a mean of 80 and a standard devotion of

A placement exam is given to all students entering a certain college. The scores are normally distributed w/ a mean of 80 and a standard devotion of 8.
What percent scored above 80?
What percent scored below 70%
What percent scored above 90%?
What percent scored between 74 and 86%?
 
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