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Scores on a statistics final in a large class were normally distributed with a mean of...

Scores on a statistics final in a large class were normally distributed with a mean of 79 and a standard deviation of 12 . Use the Cumulative Normal Distribution Table to answer the following.

(a) What proportion of the scores were above 90 ?

(b) What proportion of the scores were below 66 ?

(c) What is the probability that a randomly chosen score is between 74 and 80 ? Round answers to at least four decimal places.

Math   Statistics-And-Probability   
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