XLd CLASS #1 Suppose that the exam grades for Class #1 are as follows: p = 61.8 σ = 12.0 Using the mean and standard deviation above and the InvNorm feature on your calculator, determine the "curve" cutoffs. Round these test grade cutoffs to one decimal. Label them underneath the curve. Test Grades b) The picture you created in part (a) contains the new curve cutoffs for each letter grade. Count how many test grades would fall in each letter grade based on the new scale. Fill in the chart. Number of Tests Number of Tests Grade Range Letter Grade (using original grades) (with curve applied) (with curve)
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We can use the following percentiles for each letter grade: - A: 90th percentile - B: 75th percentile - C: 50th percentile - D: 25th percentile Now, we can use the InvNorm function on the calculator to find the z-scores for each percentile: - A: InvNorm(0.9) = Show more…
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