15
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the average is 16 11+16+15+22=64 64/4=16
16
One possible set is {-3.5, 6.5, 9.5, 11.5}
All except 15
The range is the maximum minus the minimum. So if there was a number set of 2,5,7,7,8,12, and 15, the range would be 15-2, or 13.