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Monday, April 30, 2012

Finding the Mean and Median of Numbers

My child is in 5th grade and this is what he is learning in that grade.

Let's start with the "median number."

Example:
15, 22, 3, 8, 18, 10, 5

First write it in order from smallest to biggest.
3, 5, 8, 10, 15, 18, 22 

Put your right pointer on the last number, and your left pointer finger on the first number. Your fingers should meet in the middle. Which in this case your fingers should land on 10. So the median number is 10.

"Mean number"
Add all the numbers, then divide the answer by how many numbers you added.

Example:
7, 12, 15, 19, 2

7+12+15+19+2=55 ÷5 (because you added 5 numbers) =11

So, the MEAN is 11


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