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For a normal population with mu = 100 and with sigma = 20, a) what is...

For a normal population with mu = 100 and with sigma = 20,

a) what is the probability of obtaining a sample mean less than 90% for a sample of n = 4 scores?

b) what is the probability of obtaining a sample mean less than 90 for a sample of n=16 scores?

c) for a sample of n = 25 scores, what is the probability that the sample mean will be within 5 points of the population mean?

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