First put them in numerical order,
12, 13, 13, 15, 15, 18.
since there is an even set of numbers the median is the mean of the two middle numbers
12, 13, 13, 15, 15, 18.
(13+15)/2=
14
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16.5 is the median.
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
13
(10, 12, 13, 17, 17, 18, 27) The median is 17. The mode is 17. The range is 17.
It is 13.5 which is the value halfway between the two middle values 12 and 15.