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genibhutson:
The average score of all golfers for a particular course has a mean of 77 and a standard deviation of 4.5. Suppose 81 golfers played the course today. Find the probability that the average score of the 81 golfers exceeded 78. Round to four decimal places.
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justus:
z(78) = (78-77)/[4.5/sqrt(81)] = 1/(1/2) = 2 P(x > 78) = P(z > 2) =
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