Learn how to calculate the interquartile range from a variety of different data types and draw and interpret box-and-whisker diagrams.

Your graph would then look like this: ... The interquartile range is the middle 50% of measurements in a data set—in other words, ...

Inter quartile range (IQR) = Q3 – Q1 = 3.75 ... This is just like the horizontal scale on a graph. Image caption, Step 2: Mark each of the 5 key values above the scale with a short vertical line.