Mathematics, 28.10.2019 20:31 musa79
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%. using the empirical rule, approximately what percent of students earned a score between 70% and 80%?
a)3.5%
b)5%
c)47.5%
d)95%
Answers: 2
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