20
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10, 20, 15, 17, 13
You average the two numbers in the middle. For example, if you have the numbers 9, 13, 17, and 20, the median is the average of 13 and 17, which is 15.
11 13 17 19
11 13 17 19
The numbers 11, 13, 17 and 19 are prime.