Homework Help: Statistics

Posted by Bryant on Tuesday, January 26, 2010 at 9:29am.

A resort tracks the number of days each guest stays. They've discovered that this variable is normally distributed with a mean of 9 days and a standard deviation of 3. They would expect 10% of the guest stay longer than how many days?

Please show statistics formula and calcuations using normal probability distribution.

Statistics - PsyDAG, Tuesday, January 26, 2010 at 10:27am
Go to the table I told you about in another post. Find the Z score that corresponds to that 10%. Put the value in the formula below to solve for x.

Z = (x - mean)/standard deviation

I hope this helps.

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