2. What do both disc brakes and drum brakes have in common? A. They both use a cable to stop the car.
B. They both squeal when they need to be replaced
C. They both use friction to stop the car.
D. The both apply pressure to the inside of a hollow chamber.
Please I need help with this!!

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.