15
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Mean: 16 Median: 17 Mode: 13 Range: 6
It is (13+14+16+17+17+18)/6.
10 7 11 12 9 13 14 11 15 16 13 17 18 15 19 20...
First, you should line up all of your numbers from least to greatest. Then, you subtract the smallest number from the largest and you will come up with your range. For example:11, 12, 13, 14, 15, 16, 17, 18, 19, 20These are already in order, so just subtract the smallest from the largest20-11=9Your range is 9.
11 12 15 16 18 17 the answer is 15.5