Combining test scores. The first Stats exam had amean of
Chapter 6, Problem 13(choose chapter or problem)
Combining test scores. The first Stats exam had amean of 65 and a standard deviation of 10 points; thesecond had a mean of 80 and a standard deviation of5 points. Derrick scored an 80 on both tests. Julie scoreda 70 on the first test and a 90 on the second. They bothtotaled 160 points on the two exams, but Julie claimsthat her total is better. Explain.
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