In a Large Lecture Class, the Professor Announced That the Scores

Multiple Choice

In a large lecture class, the professor announced that the scores on a recent exam were normally distributed with a range from 51 to 87. Using the Empirical Rule μ ± 3σ to estimate σ, how many students would you need to sample to estimate the true mean score for the class with 90 percent confidence and an error of ±2?

A) About 17 students
B) About 35 students
C) About 188 students
D) About 25 students