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To find the median of a set of numbers write them in order, then:

* if there are an odd number of numbers then the median is the number in the middle

* otherwise there are an even number of numbers and the median is the mean average of the two numbers in the middle.

With 4 numbers there is an even number of numbers, so the median is the mean average of the 2nd and 3rd numbers when they are sorted into order.

Example: Find median of {3, 9, 4, 5}

Ordered → {3, 4, 5, 9}

→ median = mean_average(4, 5) = (4 + 5) ÷ 2 = 4.5

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The median will be 4

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Q: What is the median of 4 numbers?
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