Answer:
14.5
Explanation:
Arrange the numbers from small to big
11, 11, 12, 13, 14, 15, 16, 16, 18, 20
If the set of data is an even number, like in this case,
Take 2 of the middle numbers:
14 and 15
Add them and divide by 2:
14+15= 29
29 ÷ 2= 14.5
I am pretty sure the answer is 14.5
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