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The first test grade distribution was normal with a mean of 80 with a standard deviation of 7.8 for my calculus class last semester. If

The first test grade distribution was normal with a mean of 80 with a standard deviation of 7.8 for my calculus class last semester. If I look at a random sample of 5 tests, what is the probability the mean of those 5 tests is 90 or above? Question 14 options: 0.207% 0.073% 5.04% 9.99%

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