A population of values has a normal distribution with �=68.1 and �=56.8. If a random sample of size �=18 is selected, Find the probability that a single randomly selected value is greater than 86.8. Round your answer to four decimals.  P(X > 86.8) =  Find the probability that a sample of size �=18 is randomly selected with a mean greater than 86.8. Round your answer to four decimals.  P(M > 86.8) =

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