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Step-by-step explanation:

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The probability of completing the exam in one hour or less is 0.0228.

Step-by-step explanation:

Given: Mean = 80

Standard deviation = 10

To find: The probability of completing the exam in one hour or less.

We have, and .

Now, the z-value is the sample mean decreased by the population mean divided by the standard deviation.

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Now,

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Again,

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Using appropriate appendix table, we get .