Help with this problem:

Assume that the speed of automobiles on an expressway during rush hour is normally distributed with a mean of 62 mph and a standard deviation of 5mph.

a.) What percent of cars are traveling faster than 62mph?

b)What percent of cars are traveling between 58 mph and 66 mph?

c)What percent of cars are traveling slower than 56 mph?

d)What percent of cars are traveling faster than 70 mph?

e) If 200 cars are selected at random, how many will be traveling faster than 70 mph?