Unit 2 · Algebra

Chapter 2.3

Averages Are Totals in Disguise

An average hides a sum, and most average problems open the moment you write that sum down.

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By the end

  1. 01Convert a mean to a total: sum equals mean times count
  2. 02Track how a mean moves when values are added or removed
  3. 03Use median and mode conditions to fix the order of unknown data

In unit 2

  1. 2.1Choosing the Unknown
  2. 2.2Rates, Ratios, and Percents
  3. 2.3Averages Are Totals in Disguise
  4. 2.4Factor Before You Compute
  5. 2.5Quadratics and Their Roots
  6. 2.6Arithmetic and Geometric Sequences
  7. 2.7Sequences Built From Their Past
  8. 2.8Functions, Graphs, and Absolute Value
  9. 2.9Which Idea Opens It? Algebra
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