Cleo paid monthly rents of $800, $820, $825, $810, and $825 over the last five years. What is the interquartile range (IQR) of her rents?

First, sort the rents: $800, $810, $820, $825, $825. The middle value is $820, so the lower half has median $805 and the upper half has median $825. The interquartile range is $825 − $805 = $20, so the answer is $20.

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