5.
This is the number which is the furthest from the others.
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11 13 15 18 20 20 The median is the middle number when they are in numerical order, so the median is 16.5. It is 16.5 because there is an even number of integers so you find the middle of 15 and 18
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20
you have to be 12 13 14 15 16 17 18 19 or 20
10 7 11 12 9 13 14 11 15 16 13 17 18 15 19 20...
69-1-1-2-2-3-3-4-4-5-5-6-6-7-7-8-8-9-9-10-10-11-11-12-12-13-13-14-14-15-15-16-16-17-18-18-19-19-20-20= -351