Arrange the numbers from smallest to greatest. The mean of the middle two numbers is the median.
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You would add the two numbers in the middle and divide them by two and the answer would be the median.
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.
To achieve a mean of 10 with four numbers, their total must be 40. If the median is also 10, then when the numbers are arranged in order, the average of the two middle numbers must equal 10. This can be done with combinations of numbers such as 5, 5, 15, and 15, which satisfy both conditions: their mean is 10, their median is 10, and none of the numbers are 10.
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.