In a psychology class of 100 students,test scores are normally distributed with a mean of 80 and a standard deviation of 5.Approximately what percentage of students have scores between 70 and 90?
A)68%
B)80%
C)95%
D)99%

Question

Quizplus · Accepted Answer

This problem requires finding the percentage of scores within one standard deviation of the mean. Using the empirical rule, we know that approximately 68% of scores fall within one standard deviation of the mean. Therefore, approximately 68% of students have scores between 75 (the score one standard deviation below the mean) and 85 (the score one standard deviation above the mean), which covers the range of 70 to 90. Therefore, option C is the correct answer.

In a Psychology Class of 100 Students,test Scores Are Normally