Assume that students a certain high school have their final scores that are normally
distributed with a mean of 120 and a standard deviation of 20

(a) If 1 final score is randomly selected, find the probability that it is less than 153

(b) If 1 final score is randomly selected, find the probability that it is greater than 165

(c)If 4 final scores are randomly selected find the probability that it is greater than 165