Using Bar Graphs and Tables To Find The Mean, Mode, Median, and Range

1
Using Bar Graphs and Tables To Find The Mean,
Mode, Median, and Range

• By James McDaniel

2
Temperature Table
3
Temperature Bar Graph
4
How do we find the Mean?

• Mean is the same as the Average.
• To compute or find the mean, we add all the
  numbers together and then divide the sum by the
  total number of data we have.

5
To find the mean using the high temperatures from
our chart or our table we add all the high
temperatures together.
Example
75 80 81 86 85 81 79 567
6
Next, we take the sum of the temperatures (567)
and divide that number by the total number of
temperatures we had to begin with. That total
number was seven (7).
Our quotient is the mean, which is 81.
7
What is Mode?

• Mode is the set of data that appears the most.
• To find the mode of the high temperatures all we
  have to do is find the temperature that appears
  most often or the most times.

8
Can you find the Mode?
Did you select 81? If you did, you are correct.
9
Is there always a Mode?

• No!
• If there is not a number that appears two or more
  times, then there is NO MODE!

10
What is the Median?

• To help you remember Median, think of the line
  that runs down the middle of the road that is
  used to separate traffic.
• That line is called the median or the middle.

11
To find the median, arrange the high temperatures
in order from lowest to highest or highest to
lowest and take the one in the middle.
75, 79, 80, 81, 81, 85, 86
or
86, 85, 81, 81, 80, 79, 75
12
What happens if there is an even number of total
temperatures and there are two numbers in the
middle?
Example
75, 79, 80, 81, 81, 83, 85, 86
13
You take the two middle numbers 81 and 81, add
them together, and divide the sum by two.
81 81 162
Then 162 divided by 2 equals.
81
14
Finally, lets find the Range!

• The Range is simply the difference between the
  highest number in the set of data and the lowest
  number.

15
You take the high temperatures highest number 86,
and you subtract the high temperatures lowest
number 75.
How do we find the Range?
86 75 11
16
Credits and References

• Clipart - http//dgl.microsoft.com/

17
Thats all folks!