Question

What is the mean and median of 7, 9, 12, 9, 13?

Answer 1

Mean=`10`

Median=`9`

Explanation:

Let's first order the numbers in ascending order. We now have

`7,9,9,12,13`

The mean is the average of our data set. We sum up our numbers, and divide by how many numbers there are. We have

`color(red)((7+9+9+12+13))/color(blue)(5)=color(red)(50)/color(blue)(5)=10`

The red expression is the sum of our data, and the blue is how many numbers we have. We find that the mean is `10`.

The word "median" literally means the middle of something. In this case, it is the middle number in our data set.

`cancel(7,9),color(darkviolet)(9),cancel(12,13)`

The middle number is `9`, therefore this is our median.

Hope this helps!