The interquartile range (IQR) tells you how spread out the middle 50% of a data set is. To find it, first sort the data in order and find the median. Then find the first quartile (Q1) and third quartile (Q3) by locating the medians of the lower and upper halves of the data. Subtract Q1 from Q3 to get the IQR. Now that you know what to do, solve five on your own.