So confused, needs help

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

If a is a nonzero real number then the reciprocal of a is

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.