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3) I.Q. is normally distributed with a mean of 100 and a standard deviation of 15. (i) Find the probability that a randomly selected person

3) I.Q. is normally distributed with a mean of 100 and a standard deviation of 15. (i) Find the probability that a randomly selected person has an I.Q. between 90 and 115? (ii) Find the probability that a randomly selected person has an I.Q. less than 55

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