The double box-and-whisker plot shows the test scores for two French classes taught by the same teacher. Double box and whisker plot shows scores for two French classes. For class A, the whisker ranges from 76 to 100. The box ranges from 84 to 92 with the vertical bar inside the box at 88. For class B, the whisker ranges from 68 to 100. The box ranges from 76 to 84 with the vertical bar inside the box at 80.

a. Express the difference in the measures of center as a multiple of the measure of variation.