Mean, Median and Mode
Mean, Median, and Mode

Mean, Median and Mode
What is the mean?
Mean, Median, and Mode
The SUM of the data, divided by the number of items in the set of data ….. commonly called “the average”.

Mean, Median and Mode
What is the mode?
Mean, Median, and Mode
The data item that appears the
“MOST”

Mean, Median and Mode
What if the data all appear the same number of times?
Mean, Median, and Mode
1,1,2,2,3,3,4,4

1,1,2,2,3,3,4,4
Mean, Median, and Mode
There is NO mode

Can there be more than one mode?
1,2,2,3,4,4,5,6,7
Mean, Median, and Mode

1,2,2,3,4,4,5,6,7
Yes, there are two modes.
What are they?
Mean, Median, and Mode
2 and 4

Mean, Median and Mode
What is the median?
Mean, Median, and Mode

What is the median?
The middle number in the set of data when written “in order” (first step we do)
Given: 2,14,28,0,1,1
Mean, Median, and Mode
Reorder from least to greatest
0,1,1,14,28
The middle number is 1

What if you have an even set of numbers?
Given: 10, 0, 20, 30
Reorder from least to greatest
0,10, 20, 30
Mean, Median, and Mode
Add the two middle numbers
15

Mean, Median and Mode
What is an outlier?
Which will an outlier affect the most: the mean, median or mode? (Hint:
Think of class test scores
A data item that is far apart from the rest of the data items

Mean, Median and Mode
What is the range?
Mean, Median, and Mode
The difference between the largest and smallest data values

Mean, Median and Mode
Let’s try one …
Step 1 –
Rewrite in order from least to greatest
Mean, Median, and Mode
2, 1, 0, 1, 5, 3, 4, 2, 0, 3, 1, 2

Mean, Median and Mode
Mean 2 Range 5
Median 2 Mode 1 and 2
Mean, Median, and Mode
2, 1, 0, 1, 5, 3, 4, 2, 0, 3, 1, 2

Mean, Median and Mode
Test scores in an Algebra class:
99, 85, 80, 25, 99, 100
What is the mean, median, mode and range?
Mean, Median, and Mode
Mean 81.3 Median 92
Mode 99 Range 75

Mean, Median and Mode
Write a paragraph about what would be your most useful indicator of central tendency in this case: You are ordering a small number of shoes for your
Mean, Median, and Mode shoe store based on the sales of sizes from last year. Write why you made your selection. Why did you not choose the other two?