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Final: A Decimal Mean

Part of the Expressions & Data section of Coddy's Pre-Algebra journey. Lesson 50 of 51.

This mean has decimals among its values. The method is the one you know: add every value, then divide by how many there are. Decimals add by place value, so look for pairs whose tenths make a whole.

Challenge

Over four days Mia ran 2.5, 4, 3.5 and 6 kilometres. The board shows the total over the count, $\frac{2.5+4+3.5+6}{4}$ . Find her mean daily distance.

Try it yourself

\frac{2.5+4+3.5+6}{4}

Simplify

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Expressions & Data

1Variables and Expressions

What a Variable Is Writing Expressions Substituting a Value Expressions from Stories Recap: Expressions

4Combining Like Terms

Like Terms Letters and Numbers Negative Terms Two Letters Distribute, Then Collect Recap: Like Terms

7Probability

Chance as a Fraction The Complement Chance as a Percent Expected Count Recap: Probability

10Final Challenges

Final: Two Brackets Final: A Cubic Expression Final: The Phone PlanFinal: A Decimal MeanFinal: The Last Spin

2Evaluating Expressions

Negative Inputs Powers in Expressions Formulas Recap: Evaluating

5Patterns and Sequences

Continuing a Pattern The Common Difference The nth Term Writing the Rule Recap: Sequences

8Tables and Charts

Reading a Table Totals and Differences Reading a Line Graph Percent of a Total Recap: Tables and Charts

3The Distributive Property

Number Properties Mental Math Distributing Letters Distributing a Minus Recap: Distributing

6Data and Averages

The Mean Mean with Negatives The Median The Mode The Range Recap: Data and Averages

9Perimeter and Area

Perimeter Area of a Rectangle Area of a Triangle Perimeter as an Expression Recap: Perimeter and Area