### Nicko's Measure of Central Tendency

Friday, October 3, 2008
Mean
The sum of the values divided by the number of values--usually called the "average."
• Place in ascending order
• Add all of the numbers together
• Divide by the number of values to get the mean

Median
The median is the middle of a distribution: half the scores are above the median and half are below the median.
• Place in ascending order
• Remove the corner numbers, repeat this until left with one or two numbers
• If left with one number, then that number is the mode
• If left with two number, find their mean and the number you get is the mode

The most common number in a set of data. There can be multiple modes
• Place in ascending order
• Observe all the numbers, look for numbers that show up multiple time
• Whichever number(s) show up, those are the mode(s)

Range
The difference between the largest number to the smallest number in the data.
• Place in ascending order
• Find the smallest and the biggest number
• Subtract the smallest from the biggest number to get the range

Here is a video on MMM