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.
21 - 12 = 9
The range is 9.
Answer: 9
Step-by-step 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
