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%

Question

Mathematics

Savanna Olsen

2 January, 06:44

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%

+3

Answers (1)

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Dixie Wiley · Answer 1

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

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%

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%