For a recent English exam,use the Normal model N(73,9.2)to find the percent of scores over 85.Round to the nearest tenth of a percent.
A)88.5%
B)90.3%
C)9.7%
D)8.1%
E)11.5%

Question

Quizplus · Accepted Answer

To find the percent of scores over 85, we first calculate the z-score: $z = \frac{85 - 73}{9.2} = \frac{12}{9.2} \approx 1.304$. Looking up this z-score in a standard normal distribution table or using a calculator, we find that the area to the right (which represents the percentage of scores over 85) is approximately 9.7%.

For a Recent English Exam,use the Normal Model N(73,9