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Mean = 7.9 Median = 7 and 8 Mode = 4 and 12 Range = 2 to 15.
Range = Maximum - Minimum = 20 - 8 = 12.
It is: 15-12-8 = -5
4/5 - 8/15 = 12/15 - 8/15 = 4/15
7/12+8/12 = 15/12 15/12 = 5/4 or 1.25