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In a study done on the life expectancy of 500 people in a certain geographic region, the mean age at death was 72 years and

In a study done on the life expectancy of 500 people in a certain geographic region, the mean age at death was 72 years and the standard deviation was 5.3 years.

What is the probability that an individual selected at random will be between 70 and 90 years old at death?

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