The probability of rolling doubles on two six-sided dice is 16. If you roll two dice 80 times, about how many doubles can you expect to roll?

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?