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The registrar at Eastern University studied the grade point average (GPAs) of its students. The GPAs are normally distributed with a mean of 2.8 and

The registrar at Eastern University studied the grade point average (GPAs) of its students. The GPAs are normally distributed with a mean of 2.8 and a standard deviation of 0.4.

a) What percentage of students a have a GPA between 2.3 and 3.8?
b) What percentage of students a have a GPA between 2.8 and 3.8?

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