Suppose exam scores are normally distributed with M = 80 and SD = 5. Approximately what percentage of scores fall between the scores of 75 and 85?
A) 34.13%
B) 68.26%
C) 13.59%
D) 2.15%

Question

Quizplus · Accepted Answer

The scores of 75 and 85 are one standard deviation below and above the mean, respectively. In a normal distribution, approximately 68.26% of the data falls within one standard deviation of the mean.

Suppose Exam Scores Are Normally Distributed with M = 80