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The manager of a night club in Boston stated that 80% of the customers are between...

The manager of a night club in Boston stated that 80% of the customers are between the ages of 21 and 29 years. If the age of customers is normally distributed with a mean of 25 years, calculate its standard deviation. (You may find it useful to reference the z table. Round "z" value to 3 decimal places and final answer to 2 decimal places.)

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Answer #1

Given that P(21<X<29)=0.80

Since ,

Therefore ,

From normal probability table

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