1. Measures of Central
Tendency
By L.D.

2. 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

3. 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

4. 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.

5. 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

6. Mini Lesson: Mean Names
 Another word for “mean” is “average”.

7. 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

8. 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