It is the mean of the number of children in the households with the 8th and 9th largest number of children.
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It is 12, the middle number.
Since there are an even number of data, the median will be the average of the middle two.So, median = (6+15)/2 = 10.5
It is 16, the middle number when the are arranged in order.
It is 18, the number in the middle when they are arranged in order.
13