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OpenStudy (tomfoolery1):
Suppose we know that a certain exam has test scores that follow a normal distribution with standard deviation σ=1.3 and mean μ=71. a. What is the probability that a randomly selected score is greater than 72 ? b. Suppose that four students’ scores are selected randomly from the same exam. What is the probability that the average score for that sample of four exams is greater than 72 ?
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