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Consider a population of children whose average nightly sleeping time is = 9 hours, = 1.5. If we take a sample of n = 225

Consider a population of children whose average nightly sleeping time is = 9 hours, = 1.5. If we take a sample of n = 225 children, what is the probability that the sample ofn = 225 children will have a mean sleeping time less than M = 8.75 hours, p(M< 8.75) = ______ ?

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