SOLUTION: There are 330 students at Valley Central High School enrolled in Chemistry. On the April report card, the students' grades are approximately normally distributed with a mean of 78

Question 1159285: There are 330 students at Valley Central High School enrolled in Chemistry. On the April report card, the students' grades are approximately normally distributed with a mean of 78 and a standard deviation of 7.9. Students who earn a grade less than or equal to 64.9 must attend summer school. The number of students who must attend summer school for Chemistry is closest to
Answer by VFBundy(438) (Show Source): You can put this solution on YOUR website!
z-score = = = -1.66

Look up -1.66 on a z-table. The result is 0.0485. This means 4.85% of the 330 students will have to attend summer school:

330 * 0.0485 = 16
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