To find the average you need to add the two numbers together and divide by two.
18 + 22 = 40
40 / 2 = 20
The answer is 20.
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The missing number is 18
The average is 23.
Average = sum(X)/n = 60/3 = 20
18.
It is: 14+15+22+21 = 72/4 => 18 which is the mean average