Grades in a large class are normally distributed with a standard deviation of 6.7% and a class average of 69.3%. SHOW YOUR WORK In each case, show a graph with the appropriate area highlighted and write a probability statement. a) If you pick a student at random, what is the probability that their grade is above 75%? Round to 4 decimal places. Number b) If you make a group with 3 students in it, what is the probability that the group's average grade is above 75%? Round to 4 decimal places. Number