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Count 5
100/5 = 20
When numbers count by five, the number you are counting to either has a 5 or 0 in it.
Sum = 117 Count = 5 So mean = Sum/Count = 117/5 = 23.4
One way is to count by 2's five times: 2, 4, 6, 8, 10The other way is to count by 5's two times: 5, 10