A11­6MeanMedianModeRange.notebook
November 18, 2014
Algebra 1
Ch.1 Notes Page 64
P64 1­6 Mean, Median, Mode, and Range
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Measures of Central Tendency
Mean = Average Add and Divide by the number of numbers
Median = Number in the Middle
Put numbers in order and find the middle
Mode = Most
The number that occurs the most in the data
An outlier is a number that does not fit with the rest of the data.
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Example
Find the mean, median, and mode of the data in the data below.
8, 2, 2, 6, 8, 4, 4, 8, 6, 2, 6, 8
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Example:
Your grades on 3 history exams are 80, 93, and 91.
What do you need on your next exam to have a 90 average?
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Range
The range of a set of data is the difference between the highest and lowest value in the set.
Find the Range of each data set.
What does this tell you about the data?
25, 30, 30, 47, 28
34, 28, 31, 36, 31
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Stem­and­Leaf Plot
Used to Organize Data so that you can see every number.
The numbers have to be put in order first.
The stems are on the Left and the leaves are on the Right
13, 8, 21, 14, 32, 7, 3, 18, 33, 20, 32, 15
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Notes Continued on Next Page...
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A11­6MeanMedianModeRange.notebook
November 18, 2014
Two Sided Stem­and­Leaf Plot
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