Question

A psychology teacher gave a test to 200 students, and, after seeing the results, decided that the scores were

normally distributed. The mean score was 60, and the standard deviation was 10. How many students had scores
between 40 and 80?

Answer 1

Explanation:

66-95-99.7 rule

standard deviation is 10. meaning that it'll deviate twice meaning you use the 95%

95% of 200 is 190, so 190 students had scores between 40 and 80