Asked by George
professor has found that the grades on a Statistics Exam are normally distributed with mean 72 and a standard deviation of 12. If only the best 15 % of the grades in the class will get an A, what grade must a student get in order to get an A?
Answers
Answered by
PsyDAG
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.15) and its Z score. Insert Z value into above equation and solve for score.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.15) and its Z score. Insert Z value into above equation and solve for score.
Answered by
Festus
answer:
x = 72 + (12*1.036) = 84.43
x = 72 + (12*1.036) = 84.43
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