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A boxplot of a batch of 33 arithmetic scores. There is a horizontal scale with an arrow head, pointing right, at the right-hand end. It is labelled percentage. The scale starts at 0 and is then marked in five intervals of 20, ending with 100. Above the line, and level with the boxplot is an asterisk at 7. The first whisker on the boxplot starts at 15. The capital Q subscript 1 is at about 58, capital M is at about 79 and capital Q subscript 3 is at about 86. The second whisker stretches to the upper extreme at 100.

 Exercises on Section 3