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April 18, 2014

April 18, 2014

Posted by **MAC** on Wednesday, September 21, 2011 at 12:04am.

There are a number of outliers, mainly vehicles with very poor gas mileage.

If we ignore the outliers, however, the combined city and highway gas mileage of the other 1120 or so vehicles is approximately Normal with mean 18.7 miles per gallon (mpg) and standard deviation 4.3 mpg.

The quartiles of any distribution are the values with cumulative proportions 0.25 and 0.75.

They span the middle half of the distribution.

What are the quartiles of the distribution of gas mileage?

What is the first quartile of the distribution of gas mileage?

Use Table A and give your answer in mpg to 1 decimal place.

- statistics -
**PsyDAG**, Wednesday, September 21, 2011 at 1:14pmIgnoring the outliers, the quartiles are at ±.675 SD.

We do not have access to Table A.

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