The interquartile range is a measure of how disbursed your data is around a mean. It’s normally used in conjunction with the mean and median of a data set. There are several ways to find an interquartile range (the easiest of which is probably our interquartile range calculator). However, you can also calculate the IQR in Excel 2007.
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Imagine all the data in a set as points on a number line. For example, if you have 3, 7 and 28 in your set of data, imagine them as points on a number line that is centered on 0 but stretches both infinitely below zero and infinitely above zero. Once plotted on that number line, the smallest data point and the biggest data point in the set of data create the boundaries of an interval of space on the number line that contains all data points in the set. The interquartile range is the length of the middle 50% of that interval of space.
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The interquartile range is the distance between the top of the lower quartile and the bottom of the top quartile. While you can use the nifty interquartile range calculator on this website, that might not be an option in a quiz or test. Finding the TI 83 interquartile range involves entering your data list and pushing a couple of buttons.

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A five number summary in statistics is made up of a Minimum, Median, Maximum and Q1/Q3. Q1 and Q3 help you to find the interquartile range: an important factor in looking at the spread of data. When you create a box plot with whiskers on the TI-89, the TI-89 will automatically calculate the five number summary for you, saving you time and effort.
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The interquartile range(sometimes called the midspread or middle 50), is a statistical measure of dispersion. It’s the distance between the 75th percentile and the 25th percentile. In order to calculate the interquartile range by hand, you would have to do a <>strong>few separate calculations, including finding the mean. Or you could use the interquartile calculator found on this site. However, you can’t bring the internet to a test, and it’s easy to make errors when calculating by hand. That’s where the TI-89 calculator comes in handy.
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Finding an interquartile range on a boxplot is easy! (If you only have numbers, see How to  find an interquartile range from a set of numbers). This how-to will show you how to find an interquartile range in a couple of easy steps.
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