Median of 13, 7, 8, 20, 11, 9, 4

Step by step

The question

Question: find the median of 13, 7, 8, 20, 11, 9 and 4.

The median is the middle number, once the numbers are in order.

1 Put them in order

First we put them in order, smallest first: 4, 7, 8, 9, 11, 13 and 20.

We still have 7 numbers.

None is lost.

2 Find the middle

We cross out the smallest and the biggest, one pair at a time.

And the next pair.

And the next pair.

9 is left in the middle.

So the median is 9.

Let's look back.

First: put them in order.

Last: find the middle.