The following is a list of GPA ranges and frequencies from a high school.Use 1.5 as the midpoint of the 2.0 or less category. 
a.What is the mean GPA?
B)What is the sample standard deviation of the GPA
C)Assuming the distribution is bell shaped what percentage of the students would have GPA's between 1.5 and 3.9? Does this make sense given what you know about GPA's?
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b.Standard D...
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