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Use the 68-95-99.7 rule Scores on a university exam are Normally distributed with a mean of 68 and a standard deviation of 9. What percentage

Use the 68-95-99.7 rule

Scores on a university exam are Normally distributed with a mean of 68 and a standard deviation of 9.

What percentage of students score above 77?

What percentage of students score between 77 and 86?

What percentage of students score between 41 and 50?

Answer format: ##.##%

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