Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 77 and a standard deviation of 8. Use the O 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 68? (c) What is the probability that a randomly chosen score is between 74 and 80? Round answers to at least four decimal places.

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Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 77 and a standard deviation
of 8. 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 68?
(c) What is the probability that a randomly chosen score is between 74 and 80?
Round answers to at least four decimal places.
Transcribed Image Text:Exam grades: Scores on a statistics final in a large class were normally distributed with a mean of 77 and a standard deviation of 8. 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 68? (c) What is the probability that a randomly chosen score is between 74 and 80? Round answers to at least four decimal places.
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