There are 35 students in a classroom, 15 of which are A-students. If the teacher calls out on 8 students at random (without replacement). What is the probability that exactly 4 are A students? Within the general population in the 2'iSt century, the chances of having twins are about 3 in about 100 (about 3%). If couples are selected at random from the population, what is the probability that the first couple with twins is randomly selected on or before the 3rd selection? The probability ofa player scoring goal is 0.70, what is the probability that aw m5\" goal is made on the players 8th shot? What is the expected value of the probability