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Transcript 
How do you know when a
result is reasonable?
Unit Questions
• Did you know that we
probably use statistics such
as mean, median, mode, and
range without even noticing
it?
• What is and how do we find
the mean, mode, median, and
range?
•Why should we learn these math
concepts?
Mean, Median, Mode,
Range
By
Nikki Goodwin
Overview
Today we will learn…
•
•
•
•
Mean
Median
Mode
Range
What is Mean?
• The mean is the
numerical average of a
set of data.
• The mean is found by
adding all the values in a
set of data, then
dividing the sum by the
number of values.
Let’s Try It…
• Lets find Dylan’s Science grade for his
report card.
97
84
88
100 95
63
73
86
97
Before we calculate the mean for this
data, Can you give me a reasonable guess?
How do you know your guess is reasonable?
Remember the steps for
finding the mean.
• Step 1- Add all the values
• Step 2- Divide
• Step 3- Find the Average
Lets find Dylan’s
MEAN science test
score?
97
84
88
100
783
÷
9
The mean is 87
+
95
63
73
86
97
783
Median
Sounds like
MEDIUM
Think middle when you hear median.
What is the MEDIAN?
How do we find it?
The MEDIAN is the number that is in the
middle of a set of data.
Steps for finding the median
1. Arrange the numbers in the set in order
from least to greatest.
2. Then find the number that is in the middle.
63 73 84 86 88 95 97 97 100
The median is 88.
Half the numbers are
Half the numbers are
less than the median.
greater than the median.
What is the MODE?
How do we find it?
The MODE is the piece of data that
occurs most frequently in the data set.
A set of data can have:
 One mode
 More than one mode
 No mode
63 73 84 86 88 95 97 97 100
The value 97 appears twice.
All other numbers appear just once.
97 is the MODE
What is the RANGE?
How do we find it?
The RANGE is the difference between
the lowest and highest values.
What is the RANGE of this set of data?
48
99
97
86
_ 99
84
88
71
48
51
51 is the range of this data set
Now you try what we just learned
Find the….
Websites
•Video on Mean,
Median, Mode,
and Range
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