NY Next Generation Math NY-7.SP.8.c

Math7th GradeFind probabilities of compound events using organized lists, sample space tables, tree diagrams, and simulation.

The Standard

Design and use a simulation to generate frequencies for compound events.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What This Standard Means

What Students Need to Do

Students design and use simulations to generate frequencies for compound events. They map random outcomes to the situation and use repeated trials to estimate probability.

What Mastery Looks Like

The student chooses a random device or digits that match each stage’s probabilities. The student records many trials, calculates relative frequency, and interprets the estimate.

Common Misconceptions

Students may use a simulation device with probabilities that do not match the situation. They may stop after a few trials or count partial trials as successes.

How to Assess It

Ask students to design a random-digit simulation for a 40 percent success rate and estimate the chance that success takes at least four trials.

Lesson moves

Ways to Teach It

  1. Assign random digits to two-stage outcomes, run repeated trials, and record compound-event frequencies.

  2. Ask students how digit assignments preserve the probabilities in the original situation.

  3. Play Simulation Design Review by checking whether proposed random devices match compound-event conditions.

  4. Simulate the chance that two deliveries both arrive on time using stated on-time rates.

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