Answer: 9
Explanation:
Range = subtract the highest number by the lowest number
Put the numbers in order from least to greatest.
12, 14, 15, 16, 17, 17, 21
21 - 12 = 9
The range is the difference between the largest number and the smallest number.
The largest number given is 21, the smallest number given is 12.
The range is 9.
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