MATH 1342 Elementary Statistical Methods Lab 3 �Ch.7 � Normal Distribution
Solved lab assignment covering normal distribution in elementary statistical methods.
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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 P70 and P90
C: Middle 40% (scores between P30 and P70)
D: Scores between P10 and P30
F: Bottom 10% of scores
20% 40% 20%
10% 10%
P10 P30 P70 P90
CLASS #1: Suppose that the 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 your calculator,
determine “the curve” cutoffs. Round these test grade cutoffs to one decimal.
Label them 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
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 P70 and P90
C: Middle 40% (scores between P30 and P70)
D: Scores between P10 and P30
F: Bottom 10% of scores
20% 40% 20%
10% 10%
P10 P30 P70 P90
CLASS #1: Suppose that the 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 your calculator,
determine “the curve” cutoffs. Round these test grade cutoffs to one decimal.
Label them 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
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Document Details
University
Community College of Qatar
Subject
Mathematics