Okay so I know to find the IQR is Q3-Q1 I did that but got the question wrong.

How do I find the IQR when the only info I have is 80=mean and 20=standard deviation?????

Thanks Kim

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- Jul 1st 2012, 11:24 PM #1

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- Jul 1st 2012, 11:26 PM #2

- Jul 1st 2012, 11:34 PM #3

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## Re: Iqr?? Ugh!!!

Because I need the median???

The whole question was:

Costs for standard veterinary services at a local animal hospital follow a Normal Model with a mean of $80 and a standard deviation of $20.

Part A was to draw the model : which I did and got right

Part B was : Is it unusual to have a veterinary bill for $125? Explain : Which I did and got right....answer was Yes because only 1.2% of bills cost $125 or higher.

Part C was : What is the IQR for the costs of standard veterinary services? Show your work.

Thank you for helping me!!

Kim

- Jul 2nd 2012, 12:23 AM #4
## Re: Iqr?? Ugh!!!

Well now that we know that it's normally distributed, convert to the standard normal probability density function. Then you need to work out where the middle 50% of the data lie. So evaluate where 75% of the data lie beneath for Q3, where 25% of the data lie beneath for Q1, then you will be able to evaluate the IQR.

- Jul 2nd 2012, 09:38 PM #5

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## Re: Iqr?? Ugh!!!

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