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5.7.PS 15
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Mario bought 60 feet of wire for $13.80. He needs 20 more feet. If the unit price is the same, how
much will he pay for the extra 20 feet of wire?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.