Out оf students thаt tаke cоurse A, the аverage final grade (mean) fоr the course is 71.4 with a standard deviation of 7.5. a. What is the z-score for someone that had a 89 in course A? [a] (round to the nearest hundredth...0.01) b. What percent of students average less than 89? [b] c. If 412 students enroll in course A, how many students would you expect to have an average that is less than 89? [c]