A coach records eight throws of 14, 2, 9, 21, 5, 17, 3 and 8 metres. What is the range of these distances? Enter the number of metres.

الشرح

Scanning the whole record gives a longest throw of 21 metres and a shortest of 2 metres, so the range is 21 - 2 = 19 metres. Stopping at the opening entries and treating 14 metres as the longest throw gives 12 instead, which is why a long unordered list has to be checked to the end before the extremes are settled.