SOLUTION: Mr Williams has 184 students in his college mathematics lecture class. The score ob the midterm exam are normally distributed with a mean of 72.3 and a standard deviation of 8.9. H

Question 1009754: Mr Williams has 184 students in his college mathematics lecture class. The score ob the midterm exam are normally distributed with a mean of 72.3 and a standard deviation of 8.9. How many students in the class can be expected to receive a score between 82 and 90?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
z=(x-mu)/sigma
(82-72.3)/8.9=1.0899
(90-72.3)/8.9=1.9888
The proportion between these z-scores is 0.1145
Multiply that by the number of students in the class, and there would be 21 students in this group.
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