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A five-figure summary. The diagram forms three sides of a rectangle, with the bottom line missing. It therefore has a vertical line to the left, a horizontal line across the top and a vertical line to the right. To the left of the left vertical line is written n = 33. Towards the bottom of the line and to its right is written 7 and above that 57. Beneath the middle of the horizontal line is written 79. To the left of the second vertical line and level with 57 is written 88. Below that and level with 7 is written 100.

 Exercises on Section 3