1. Students calculate and interpret weighted averages and weighted sums.
2. Students use and calculate indices to understand and compare data.
3. Students make decisions, predictions, and critical judgments based on data and numerical summaries such as weighted averages and weighted sums.
• Solving problems involving rational numbers, ratios, percent’s, and proportions in the context of a situation
• Judging the reasonableness of numerical computations and their results
Student Activity Sheet 10: Readability
• Old Ideas: Applying formulas involving ratios
• New Ideas: Applying indices to real-world situations
index (indices), paradox, weighted average, weighted sum
• Graphing calculators or spreadsheet application
• Computer with a projection device that has Microsoft Word installed (optional)
• Internet access for student data research Additional Background
Discuss the problem-solving strategy “Use a similar problem.” The familiar problem of finding a grade average can serve as a prototype for the other problems in this section.
Things to Watch for
To minimize the time required for an activity, monitor how the small groups divide the tasks among group members. Discuss this aspect of small-group work with the class before beginning this work.
Standards and Objectives for the Unit.