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Please teach how to solve 4) Find the probability that a randomly selected adult has an IQ between 110 and 120(referred to as bright normal)

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4) Find the probability that a randomly selected adult has an IQ between 110 and 120(referred to as bright normal) 5) Find P30 which is the IQ score separating the bottom 30% from the top 70%al For the following problems, assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15

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