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.

Your graph would then look like this: Quartiles are also used to calculate the interquartile range, which is a measure of variability around the median. The interquartile range is simply the range ...