The median is the "middle" so put them in order first.
1, 4, 5, 9, 10, 15
You will notice that you have an even amount of numbers and surely will have two medians: 5 and 9. Find their average and the median of this set in 7.
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1, 6, and 11
A paradox occurs in the space-time continuum and the universe ceases to exist ;) But seriously, what you probably REALLY mean is how do you find the median of a list of numbers with an even number of numbers. When you have an even number of numbers, you take the average of the two middle numbers. So for example: 1, 6, 8, 10, 15, 20 The two middle numbers are 8 and 10. The average of 8 and 10 is 9, so the median of the above example is 9.
The middle two numbers are 8 and 10 so the median is 9.
Whatever you like. The median value for each of the following three sets is 10. For the set {1, 9, 11, 12}. the mean is 8.25, smaller than the median. For the set {1, 9, 15, 15}. the mean is 10, the same as the median. For the set {1, 9, 15, 16}. the mean is 10.25, larger than the median.
1, 4, 10