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4. A normally distributed population has a mean of 500 and a standard deviation of 60 . a. Determine the probability that a random sample

image text in transcribed 4. A normally distributed population has a mean of 500 and a standard deviation of 60 . a. Determine the probability that a random sample of size 16 selected from this population will have a sample mean less than 475 . b. Determine the probability that a random sample of size 25 selected from the population will have a sample mean greater than or equal to 515

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