Question: Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of79 and a standard deviation of9. Use the

Exam grades:Scores on a statistics final in a large class were normally distributed with a mean of79 and a standard deviation of9. Use the TI-84 PLUS calculator to answer the following. Round the answers to at least four decimal places.

(a) What proportion of the scores were above 91? (b) What proportion of the scores were below 65? (c) What is the probability that a randomly chosen score is between 70 and 86? What proportion of the scores were above 91? The proportion of scores above 91 is D

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