# Math Help - Iqr?? Ugh!!!

1. ## Iqr?? Ugh!!!

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

2. ## Re: Iqr?? Ugh!!!

Originally Posted by kshaffer
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
You can't.

3. ## 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

4. ## Re: Iqr?? Ugh!!!

Originally Posted by kshaffer
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
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.

5. ## Re: Iqr?? Ugh!!!

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