Question

The grades on the last history exam had a mean of 80%. Assume the population of grades on history exams is known to be distributed normally, with a standard deviation of 5%. Approximately what percent of students earn a score between 70% and 80%?

A. 2.2%
B. 10%
C. 47.7%
D. 50%
E. 52.5%

Answer 1

47.7%

Explanation:

i got it right on a test

Answer 2

I got C because A and B are too small for the standard division to be a mean of 80% and the number also cannot be 50% or higher because it could bring the median lower and or higher