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Recycling Drive: Audit the Random Picks

Build uniform probability models for a recycling drive, predict selections, and evaluate differences between model probabilities and trial results.

Grade 7MathInteractive · Printable

Aligned to7.SP.C.7.a

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
14 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 7
Subject: Math
Question types: Fill in the blank, Multiple choice, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

Students build uniform probability models and calculate probabilities for groups of equally likely outcomes.
Students compare predicted probabilities with observed relative frequencies and explain differences.

How to use

Use after introducing equally likely outcomes. Have students keep the original sack inventory visible, then distinguish chance variation from recording errors.

Curriculum

Common Core standard covered

7.SP.C.7.a

Build a uniform probability model, where every outcome is equally likely, use it to find probabilities, and compare probabilities from a model to observed frequencies and explain differences.

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Recycling Drive: Audit the Random Picks

Build uniform models and compare predictions with trial records.

Model the Inspection Picks

The drive collects cans, bottles, and paper in 20 numbered sacks. A random-number selector chooses each number from 1 through 20 with equal probability. Use the inventory below for questions 1–9.