This document defines and provides examples to illustrate mean, median, and mode. It explains that mean is the average found by dividing the sum of a data set by the number of values. Median is the middle number when values are arranged in order. Mode is the value that occurs most frequently in a data set. Examples are provided to show how to calculate each measure using various data sets. The document also mentions range as the difference between the largest and smallest values in a data set.

1. MeanMedian
Mode

2. The average of a set of
numbers, found by dividing the
sum of the set by the number
of addends.
Mean
Think about when your
grades are averaged in
school.

3. MeanHere is an example: 74, 91, 63, 92, 85
74 405 ÷ 5 = 81
91
63
92
+85
A calculator is
very helpful.

4. Now let’s try one together.
Get your calculators ready.
Add these numbers:
100 + 85 +++ 90 75 85 =
435 is your total.
Now it is time to divide.
435 ÷ by how many numbers there are 5 =
Did you get 87?

5. Median
The middle number in a set of data
that are arranged in order.
Think of monkey in the middle.
Who me?

6. Here is an example:
1, 3, 4, 6, 7
median
The median of 1, 3, 4, 6, and 7 is 4.
Median
Which number is in the middle?
21, 16, 38, 32, 25
Here is one for you to try. You have to
put them in order first!
25

7. The number or item that occurs most
often in a set of data.
Mode
When you think of mode, think
MOST.
Which fruit is there the most of?

8. ModeHere is an example:
1, 3, 4, 4, 6
4 occurs most often.
The mode of 1, 3, 4, 4, and 6 is 4.Time for you to try one. Remember, put
them in order first!
31, 21, 31, 21, 21, 21
21 is the mode since it occurs most often.

9. Let’s listen to a song about all
three!

10. Let’s find the mean, median and mode
of these numbers.
14 ,21 ,42 ,21 ,35 ,21 ,49
Mean – Remember this is the average.
First, add the numbers.
14 + 21 + 42 + 21 + 35 + 21 + 49 = 203
Next, count how many numbers you have. 7
Then, we divide our total 203 ÷ 7.
Our mean is 29 !

11. Median – Don’t forget this is the number
in the middle.
17,19,21,21,21,33,42
A great strategy to help you is
to mark out the numbers on the
end to get to the number in
the middle.
X X
21 is the median!

12. Mode – Remember this is the
number or item that occurs
the most.
17, 21, 42, 21, 19, 21, 33
What number was repeated the most?
21 is the mode!

13. Range
Is the difference between the largest
value and the smallest value.
Let’s go back through the slides to find
the range of each set of data.

14. http://www.quia.com/rr/51667.html
http://www.bbc.co.uk/schools/ks2bitesize/maths/activities/modemedianmean.shtml
http://www.bbc.co.uk/schools/ks2bitesize/maths/tests/modemedianmean.shtml
Let’s at some websites.