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OpenStudy (itsmichelle29):
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%? 2.2% 47.7% 50% 52.2%
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OpenStudy (itsmichelle29):
is it B??
OpenStudy (anonymous):
yup
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