The grades on the last math exam had a mean of 72%. Assume the population of grades on math exams is known to be distributed normally, with a standard deviation of 5%. Approximately what percent of students earn a score between 72% and 87%? a. 49.9% b. 1% c. 50% d. 47.7% I think it's D.

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The grades on the last math exam had a mean of 72%. Assume the population of grades on math exams is known to be distributed normally, with a standard deviation of 5%. Approximately what percent of students earn a score between 72% and 87%? a. 49.9% b. 1% c. 50% d. 47.7% I think it's D.

Mathematics
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If the standard deviation is 5%, then the question asks what percentage of students lie between the mean (72) and 3 standard deviations (3 x 5% = 15%) above the mean. Check your normal distribution graph to figure it out.
I dont have a graph tho
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