Jas M.

asked • 12/03/21

The results on a final exam given by a university professor are normally distributed with a mean of 65.3% and a standard deviation of 8.5.

The results on a final exam given by a university professor are normally distributed with a mean of 65.3% and a standard deviation of 8.5. A student with a mark of 70% on the exam justified it to his parents and told them no one got over 80% on the exam. Should his parent’s believe him? Explain your answer. Show all required calculations/commands.

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Marlene L. answered • 12/08/21

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Fifty percent of the students made between 65% and 90.8% on the exam. .

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Marlene L.

According to the Empirical Rule, approximately 47.7% of the class made 82% on the exam. Approximately 2% of the class made MORE than 90% on the exam. 80% falls within 1 and 2 standard deviations of the mean. His parents should question the student.
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12/08/21

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