4 Keenan scored 80 points on an exam with a mean score of 77 points and a standard deviation of 4 9 points Rachel scored 78 points on an exam with a mean of 75 points and a standard deviation of 3 7 points Part A Find Keenan s z score for his exam and Rachel s z score for hers Part B It is meaningless to compare Keenan s and Rachel s scores directly because they each took a different exam How could you use statistics to compare Keenan s