Katrina's Measure of Central Tendency

Tuesday, September 30, 2008
Mean: The mean is the average number. When you add up all the numbers in a set of data, you divide the total by the number of data.

5, 3, 18, 17, 2
5, 3, 18, 17, 2 = 2, 3, 5, 17, 18
2 + 3 + 5 + 17 + 18 = 45 / 5 = 9.
The mean or average of this data is 9.


Median: To locate the median, you have to look for the middle number.

5, 3, 18, 17, 2

5, 3, 18, 17, 2 = 2, 3, 5, 17, 18
Cross out each number on the side until you hit the middle. 2, 3, 5, 17, 18

Mode: The mode is the number that appears the most in a set of data.

5, 3, 18, 17, 2

5, 3, 18, 17, 2 = 2, 3, 5, 17, 18
look for the most common number. In this set of data, there is no mode.

Range: The range is when you subtract the smallest number from the largest number.

Outlier: An outlier is the outcast number in a set of data.
For example, in this set of data, all the numbers are near each other except for the 50.

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