MATH 1342 Name ___________________________ Elementary Statistical Methods Lab 3 – Ch.7 – Normal Distribution Critical Thinking; Communication Skills; Empirical/Quantitative Skills MATH 1342 Elementary Statistical Methods Lab 3 – Ch.7 – Normal Distribution Grading using “The Curve” When grading using “the curve”, the percentages are as follows: A: Top 10% of scores B: Scores between P 70 and P 90 C: Middle 40% (s cores between P 30 and P 70 ) D: Scores between P 10 and P 30 F: Bottom 10% of scores 20% 40% 20% 10% 10% P 10 P 30 P 70 P 90 CLASS #1: Suppose that t he exam grades for Class #1 are as follows: 35 44 46 47 48 51 54 55 55 57 57 58 59 60 60 60 60 61 62 64 68 69 70 72 73 75 75 77 82 85 μ = 61.3  = 11.5 a) Using the mean and standard deviation above and the invNorm feature of y our calculator , determine “ the curve” cutoffs. Round these test grade cutoffs to one decimal. Label th em underneath the curve . Bottom 10% score =46.6; bottom 30% score =55.3; 70% score =67.3; 90% score =76.0 Test Grades  46.6 55.3 67.3 76.0