The grades in a standardized test have a mean of 78, a known standard deviation of 8, and are normally distributed. What is the probability for the mean of a class of 25 students to exceed 80?
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We are given that the grades in a standardized test are normally distributed with a mean (μ) of 78 and a standard deviation (σ) of 8. We need to find the probability that the mean grade of a class of 25 students exceeds 80. Show more…
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