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!