### Melanie's Measures of Central Tendency

5:44 PM

Mean - the average of a set of data
To find the mean:
1. arrange in ascending order (optional)
3. divide the sum of all data, by how many pieces of data there are
4. the final result is the mean
if you have an outlier it will change the mean

Median - the number in the middle of a set of data
To find the median:
1. arrange in ascending order (IMPORTANT)
2. cross out one piece of data from the left, then the right, then the left, and so on, until you reach the middle number
3. the final result is the median
if you have an even number of data, you'll end up with two middle numbers, so you need to find the middle of those two numbers (sum of two numbers, divided by 2)
if you have an outlier, use the median, instead of the mean, to find the average

Mode - the number in a set of data, that appears the most
To find the mode:
1. arrange in ascending order
2. find the number that appears the most
3. the final result is the mode
sometimes there could be MORE than one mode
sometimes there is NO mode

Range - the difference between the greatest and least piece of data in a set
To find the range:
1. arrange in ascending order
2. find the greatest and least piece of data
3. subtract the least piece of data from the greatest piece of data
4. the final result is the range

Here is a video, that shows how to find the mean, median, and mode:

#### 5 Responses to "Melanie's Measures of Central Tendency"

October 10, 2008 at 4:29 PM
good job theres nothing worng with with yours but you commented on mine so i did on yours great job:)
October 12, 2008 at 9:12 PM
Good job. There is lots of information in it. Very easy yo understand. *gives a thumbs up*
October 14, 2008 at 8:08 PM
lots of different colours :)
October 14, 2008 at 8:42 PM
haha shaneille, and theres only three colours, ahah :P
by the way, thanks to all the people for commenting :)
October 15, 2008 at 7:36 PM
Good work Melanie!:)