IQR = Q3 - Q1 IQR = 87 - 81 IOR = 6 Now find the IQR of this box plot. High Temperature, March 12 -21, 2017 70 72 74 76 Temperature (F) The IQR is Even though the range showed more variability of the temperatures in 2016, the IQR was smaller. If we know there are outliers in the data, we should use the IQR. For these data sets, the IQR of the 2016 temperatures is smaller. Therefore, based on the IQR, there is less variability and the data is more consistent (closer in value) for the 2016 temperatures. Check