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O 18.96 A random sample of size 100 is drawn from a population with a standard deviation of 10. If only 15% of the time

O 18.96 A random sample of size 100 is drawn from a population with a standard deviation of 10. If only 15% of the time a sample mean greater than 20 is obtained, the mean of the population is 9.60 18.35 19.61 20.35

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