SOLUTION: Suppose that the scores on the final exam for this course are normally distributed with a mean of 55 and a standard deviation of 10. I decide to “curve” student grades by adding 3

Algebra ->  Probability-and-statistics -> SOLUTION: Suppose that the scores on the final exam for this course are normally distributed with a mean of 55 and a standard deviation of 10. I decide to “curve” student grades by adding 3      Log On


   

Question 597377: Suppose that the scores on the final exam for this course are normally distributed with a mean of 55 and a standard deviation of 10. I decide to “curve” student grades by adding 30 points to each student’s final exam grade.
What is the new mean and new standard deviation?
Is it fair to curve by adding 30 to each grade? Why or why not
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose that the scores on the final exam for this course are normally distributed with a mean of 55 and a standard deviation of 10. I decide to “curve” student grades by adding 30 points to each student’s final exam grade.
What is the new mean and new standard deviation?
Is it fair to curve by adding 30 to each grade? Why or why not
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New Mean: 55+30 = 85
New std: It's still 10 (the spread has not changed)
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If 55 WAS a failing grade and 85 is a "B", grade inflation is involved.
Cheers,
Stan H.