But seriously you don't, you should just do it by hand and stop relying on technology.How do you find inter-quartile range on a TI-89 calculator?To my knowlege you can't.
Interquartile range is VERY easy to find by hand. If you find the five important points of a box and whiskers plot, then you basically just have to subtract. To find it, subtract the upper quartile and the lower quartile (for example, if the UQ is 50 and the LQ is 34, you would do 50-34).
If you don't know how to find the five important points (Upper Extreme, Upper Quartile, Median, Lower Quartile and Lower Extreme), let me know and I'll explain.
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