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IQ scores form a normal distribution with a mean of = 100 and a standard deviation of = 15. What is the probability of obtaining

IQ scores form a normal distribution with a mean of = 100 and a standard

deviation of = 15. What is the probability of obtaining a sample mean

greater than M = 103.

a) for a random sample of n = 9 people?
b) for a random sample of n = 25 people?
c) for a random sample of n = 100 people?

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