Question 548423
At one college GPA's are normally distributed with a mean of 2.8 and a standard deviation of .5. What percentage of students at the college have a GPA between 2.3 and 3.3?
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How far is 2.3 from 2.8? answer is (2.3-2.8) = -0.5
That means 2.3 is one standard deviation to the left of the mean.
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How far is 3.3 from 2.8? answer is (3.3-2.8) = 0.5
That means 3.3 is one standard deviation to the right of the mean.
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According to the empirical rule 68% of normally distributed 
data is within 1 standard deviation of the mean.
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So your answer should be "C".
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Cheers,
Stan H.
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a)84.13% b)99.74% c) 68.26% d) 95.44%