Digits, Grade 8, Volume 2, Homework Helper

Topic 12: Samples

12-1: Mean

Key Concept

Visual Model

You can use a visual model to represent the mean of a data set.

Number of Inches of Snow

2, 4, 5, 1

Modeling a data set

The mean is the value you get if you distribute the blocks equally.

Modeling the mean of a data set

Definition and Formula

The mean is a measure of center in a set of numerical data. You calculate the mean by adding all the data values together and dividing the sum by the total number of data values.

table with 3 rows and 2 columns , row1 column 1 , mean , column 2 equals . fraction sumofthedatavalues , over totalnumberofvalues end fraction , row2 column 1 , mean , column 2 equals . fraction 2 plus 4 plus 5 plus 1 , over 4 end fraction , row3 column 1 , , column 2 equals 3 , end table

The mean of the data set is 3.


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Table of Contents

Digits, Grade 8, Volume 2, Homework Helper Unit D: Two-Dimensional Shapes Unit E: Measurement and Data Unit F: Personal Financial Literacy Unit G: Step-Up Lessons English/Spanish Glossary Formulas Math Symbols Formulas Measures Properties