Assume the speed of automobiles on a highway during rush hour is normally distributed with a mean of 62mph and a standard deviation of 5mph. What percent of cars are traveling faster than 70mph?

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?