Grading using \"The Curve\". When grading using \"The Curve\", the percentages a

Question

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

Math 1342WS1 Spring 2018 Lab 3 42 of8 (o complete) CLASS #2 Suppose that the exam gades for Class #2 are as follows 55 64 66 67 68 71 74 75 75 77 77 78 79 80 80 80 80 81 82 84 88 89 90 92 93 95 95 97 100 100 ? 81 1 .11 1 3. Using the mean and standard deviation above and the invNorm feature of your calculator, determine the curve cutofs. Round these test grade cutofs to one decimal Label them underneath the curve Then, look at the 30 test grades and count how many test grades would fall in each letter grade based on the new scake the 30 test range of scores for each letter grade under this plan. 4. Use the picture you created above to fill in the chart below with the new Letter GradeRange of ScoresRumber off to 100 to to to 0 to Enter your answer in each of the answer boxes O Type here to search

Explanation / Answer

Grading using "The Curve". ( We use Excel to solve the prolem)

When grading using "The Curve", the percentages are as follows:

We have used the NORMSINV(p) formula, where p is the cumulative probabiliy

A: Top 10% of scores = NORMSINV(0.9) = 1.28*11.1 + 81.1 = 95.308

B: Scores between P70 and P90 = (1.28*11.1 + 81.1 )-(.524*11.1 + 81.1) = 8.392

C: Middle 40% (Scores between P30 and P70) = (.524*11.1 + 81.1)-(-.524*11.1 + 81.1) = 11.633

D: Scores between P10 and P30 = (-.524*11.1 + 81.1)- (-1.28*11.1 + 81.1) =8.392

F: Bottom 10% of scores = (-1.28*11.1 + 81.1) = 66.892

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