Abookcase in a classroom contains textbooks that weigh 0.8 pound each. the bookcase alone weighs 22.2 pounds. if the total weight of the books and the bookcase is 31.8 pounds, how many books are in the bookcase?

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.