Question

A solution that is used to kill bacteria is tested. This solution kills the following percentage of bacteria in six trials: 85, 84, 87, 86, 90, 80. Use the data to make a box and whisker plot.

Answer 1

80,84,85,86,87,90

minimum = 80
Q1 = 84
Q2 (median) = (85 + 86) / 2 = 171/2 = 85.5
Q3 = 87
maximum = 90
             Q1     Q2          Q3
               ^___^_______^
  --80-----| ___|_______ | -----90                    
               ^      ^             ^
              84     85.5      87


80, minimum, is on outside of box (before Q1)......84 (Q1) is where box starts.....85.5 (median or Q2) is inside the box.....87 (Q3) is the end of the box......90, maximum, is outside the box (after Q3)