Answer: 22
Explanation:
The mean is the average of the number.
Step 1 : Add up all the numbers
Step 2: Then divide by how many numbers there are
15 + 22 + 19 + 20 + 29 + 18 + 25 + 19 + 31 = 198
198 ÷ 9 = 22
The mean is 22
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