The scores on the PDI, a scale of infant development, are approximately normally distributed with me
Question: The scores on the PDI, a scale of infant development, are approximately normally distributed with mean 100 and standard deviation 15. If an infant is selected at random, what is the probability that their PDI score exceeds 103? If a study uses a random sample of 225 infants, find the probability that the sample mean exceeds 103.
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