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What is the probability of getting a mean

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An aptitude test for high school students is designed so that scores on the test have the mean 90 and the standard deviation 20. Students in a school are randomly assigned to various sections of that course. In one of these sections of 100 students, the mean score is 86. If the assignment of students is indeed random, what is the probability of getting a mean of 86 or lower on that test?

Reference no: EM132855915

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