Abag contains a total of 100 black and white marbles. without looking in marble is chosen, recorded, and placed back in the bag. the student records a black marbles and two white marbles. predict the number of black marbles in the bag.

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.