Range is the positive difference between the smallest and largest number.
Step 1: Put all the numbers in order from smallest to largest.
6, 6, 7, 8, 9, 12, 15
Smallest #: 6
Largest #: 15
15
- 6
------
9
Your range is 9.
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There are probably tens of such sets. Some are: 5, 6, 7, 7, 8, 11, 13, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 15, 17, 18 5, 6, 7, 7, 7, 12, 12, 14, 15, 16, 16, 18 5, 6, 7, 7, 7, 12, 12, 14, 14, 16, 16, 18
Mean = 7.9 Median = 7 and 8 Mode = 4 and 12 Range = 2 to 15.
8 + 7 - 9 + 6 - 3 = 9 8 + 7 = 15 15 - 9 = 6 6+6 = 12 12 - 3 = 9
252.
5 6 7 10 4 15 12