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8.70. A random sample of size 64 is taken from a nor- mal population with u = 51.4 and or = 6.8. What is the

8.70. A random sample of size 64 is taken from a nor- mal population with u = 51.4 and or = 6.8. What is the probability that the mean of the sample will (a) exceed 52.9; (b) fall between 50.5 and 52.3; (c) be less than 50.6

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