Box and Whisker Plots 50% 98 86 98 88 95 59 64 55 91 92 76 79 95 98 85 83 91 99 80 77 68 Step 1 – Order the series of numbers from least to greatest 55 59 64 68 75 76 77 79 80 83 85 86 88 91 91 92 95 95 98 98 98 99 Step 2 – Find the median of the numbers (the middle number) you might have to average two numbers - This is the 2nd quartile 85.5 Step 3 – Find the median of the numbers from the second quartile to the lower extreme (This is the 1st quartile “Lower Quartile”) 76 Step 4 – Find the median of the numbers from the second quartile to the upper extreme (This is the 3rd quartile “Upper Quartile”) 95 Step 5 – Plot the numbers and quartiles on a number line that only includes the range 55 60 65 70 75 80 85 90 95 99