the height of a cellular antenna tower is measured to be 32.1 m to the nearest tenth of a meter. what is the upper bound for the actual height of the tower?

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?