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

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Answer 1 · 2018-06-08T03:28:57

Mean= $10$

Median= $9$

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!