The "median" is the "number in the middle", if you sort the numbers. If (as here) the set has an even number of elements, you sort them, and then take the average (arithmetic mean) of the two numbers in the middle - in this example, the 5th and 6th number.
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When numbers are put in order either least to greatest or greatest to least, the one in the middle is the median. In an even set of numbers the average of the middle two numbers is the median. 30.5 is the median of these 3 numbers.
Arrange the numbers from smallest to greatest. The mean of the middle two numbers is the median.
Then that is the median. A median does not have to be a whole number. It can be a decimal number, even when the set of the numbers you are getting the median for are all whole numbers.
Median is the middle value in a set of numbers. The median of 278 is 278.
There would be no median.