In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54.The professor tells David he scored at the 76th percentile.How many hours does he study per week? (Round z score to two decimal places.)
A) 13.14 hours
B) 8.64 hours
C) 12.88 hours
D) 16.24 hours

Question

Quizplus · Accepted Answer

The z-score for the 76th percentile is 0.71. Using the formula z = (x - mu) / sigma, we can solve for x: 0.71 = (x - 9.92) / 4.54. Solving for x, we get x = 13.14 hours.

In One Statistics Course, Students Reported Studying an Average of 9.92