measures of central tendency
DESCRIPTION
TRANSCRIPT
Measures of Central TendencyBy L.D.
Table of Contents
Slide 3: Foreword
Slide 4: How to Find Median
Slide 5: How to Find Mean
Slide 6: Mini Lesson: Mean Names
Slide 7: How to Find Mode
Slide 8: How to Find Range
Forward
We will be using the problem below as an example problem to find the median, mean, mode and range.
Marcella was played 5 ballgames where she scored the scores below.
28, 18, 24, 22, 18
The best thing to do for the next few problems is put the numbers in numerical order.
18, 18, 22, 24, 28
How to Find Median
You organize the numbers in numerical order.
18, 18, 22, 24, 28
The number of middling value is the median, in this case it is 22.
Sometimes there is no median at all.
How to Find Mean
Numbers: 18, 18, 22, 24, 28
To find the mean you add up all the numbers.
18 + 18 + 22 + 24 + 28 = 110
Then you take the 110 and divide it by the number of numbers, which is 5 in this case.
110/5 = 22
Mean: 22
Mini Lesson: Mean Names
Another word for “mean” is “average”.
How to Find Mode
Numbers: 18, 18, 22, 24, 28
To find this one you take the number that has the most of itself in the list and call it your mode.
In this case it is 18
There can be multiple duplicates of a number, but the mode will only be one number.
It is easier to find the mode if the numbers are in numerical order.
Mode: 18
How to Find Range
Numbers: 18, 18, 22, 24, 28
To find the range you take the maximum or the largest number and minus the minimum or smallest number from it.
28 – 18 = 10
Range : 10
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