15 - it has 3 numbers either side of it.
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It is 9, the middle number when they are listed in order.
Yes. In the set (9, 10, 11, 12, 13) 11 is the median and the mean.
Mean = 14 Median = 12 Mode = 12
13
Arrange in order: 12 13 13 14 16 18 19 The median is the number in the middle, where there are are as many other numbers on one side as the other: Answer is median = 14