If grades on an exam are approximately normally distributed, with an average 70     and standard deviation of 10, what percentage of the students:a.  

If grades on an exam are approximately normally distributed, with an average 70     and standard deviation of 10, what percentage of the students:a.         received grades less than 70?b.         received grades greater than 70?c.         received grades less than 60?d.         received grades less than 50?e.         received grades less than 50 or greater than 90?f.   received grades greater 85?g.         received grades less than 45?h.         received grades between 45 and 85?

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