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4. Professor grades the Economics exam as Z scores. Mean score on the exam is 90 and a standard deviation of 2. a. Kelly Z

4. Professor grades the Economics exam as Z scores. Mean score on the exam is 90 and a standard deviation of 2.

a. Kelly Z Score is 0.What's her score on the Exam?

b. Estimate the top 2.5% of the Exam Scores.c.Estimate the 80% Probability of all Exam scores.

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