Can you show me how to solve this for the standard deviation? The manager of a n

Question

Can you show me how to solve this for the standard deviation?

The manager of a night club in Boston stated that 90% 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. (Round your answer to 2 decimal places.)

The manager of a night club in Boston stated that 90% 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. (Round your answer to 2 decimal places.)

Explanation / Answer

We see than the difference between mean and the extreme values is 4 each. Also.for 90% confidence, z is 1.65

Thus, 4/sd= 1.65 or sd is 4/1.65 i.e 2.42

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