New York State Common Core

7 GRADE

Mathematics Curriculum GRADE 7 • MODULE 5

Topic A:

Calculating and Interpreting Probabilities 7.SP.C.5, 7.SP.C.6, 7.SP.C.7, 7.SP.C.8a, 7.SP.C.8b Focus Standard:

7.SP.C.5

Understand that the probability of a chance event is a number between 0 and 1 that expresses the likelihood of the event occurring. Larger numbers indicate greater likelihood. A probability near 0 indicates an unlikely event, a probability around 1/2 indicates an event that is neither unlikely nor likely, and a probability near 1 indicates a likely event.

7.SP.C.6

Approximate the probability of a chance event by collecting data on the chance process that produces it and observing is long-run relative frequency, and predict the approximate relative frequency given the probability. For example, when rolling a number cube 600 times, predict that a 3 or 6 would be rolled roughly 200 times, but probably not exactly 200 times.

7.SP.C.7

Develop a probability model and use it to find probabilities of events. Compare probabilities from a model to observed frequencies; if the agreement is not good, explain possible sources of the discrepancy.

7.SP.C.8a 7.SP.C.8b

a.

Develop a uniform probability model by assigning equal probability to all outcomes, and use the model to determine probabilities of events. For example, if a student is selected at random from a class, find the probability that Jane will be selected and the probability that a girl will be selected.

b.

Develop a probability model (which may not be uniform) by observing frequencies in data generated from a chance process. For example, find the approximate probability that a spinning penny will land heads up or that a tossed paper cup will land open-end down. Do the outcomes for the spinning penny appear to be equally likely based on the observed frequencies?

Find probabilities of compound events using organized lists, tables, tree diagrams, and simulation. a.

Topic A: Date: © 2013 Common Core, Inc. Some rights reserved. commoncore.org

Understand that, just as with simple events, the probability of a compound event is the fraction of outcomes in the sample space for which the compound event occurs.

Calculating and Interpreting Probabilities 3/20/14 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

9

Topic A

NYS COMMON CORE MATHEMATICS CURRICULUM

b.

Instructional Days:

7•5

Represent sample spaces for compound events using methods such as organized lists, tables and tree diagrams. For an event described in everyday language (e.g., “rolling double sixes”) identify the outcomes in the sample space with compose the event.

7

Lesson 1: Chance Experiments (P)

1

Lesson 2: Estimating Probabilities by Collecting Data (P) Lesson 3: Chance Experiments with Equally Likely Outcomes (P) Lesson 4: Calculating Probabilities for Chance Experiments with Equally Likely Outcomes (P) Lesson 5: Chance Experiments with Outcomes that Are Not Equally Likely (P) Lesson 6: Using Tree Diagrams to Represent a Sample Space and to Calculate Probabilities (E) Lesson 7: Calculating Probabilities of Compound Events (P)

Related Topics: More Lesson Plans for Grade 7 Common Core Math In Topic A, students begin a study of basic probability concepts (7.SP.C.5). They are introduced to the idea of a chance experiment and how probability is a measure of how likely it is that an event will occur. Working with spinners and other chance experiments, students estimate probabilities of outcomes (7.SP.C.6). In Lesson 1, students collect data they will use to estimate a probability in Lesson 2. Lesson 2 also provides additional opportunities to use data to estimate a probability. In Lesson 3, students are introduced to the terminology of probability, including event, outcome, and sample space. They are asked to think about chance experiments in terms of whether or not outcomes in the sample space are equally likely. In Lesson 4, they determine the sample space for a chance experiment and calculate the probabilities of events based on the sample space (7.SP.C.7). In this lesson, students also learn to assign probabilities to outcomes in a sample space when the outcomes are equally likely. They then calculate the probability of compound events that consist of more than a single outcome. This lesson leads students to see that when outcomes are equally likely, the probability of an event is the number of outcomes in the event divided by the number of outcomes in the sample space. In Lesson 5, students begin to analyze chance experiments that have outcomes that are not equally likely. They calculate probabilities of various events by adding appropriate probabilities. Students learn in Lesson 6 to represent a sample space by a tree diagram and use the tree to calculate probabilities of compound events (7.SP.C.8). In Lesson 7, students calculate probabilities of compound events using sample spaces represented as lists of outcomes and presented as tree diagrams. This topic moves students from calculating and interpreting probabilities in simple settings into the lessons of Topic B, where students estimate probabilities empirically based on a large number of observations and by simulation.

1

Lesson Structure Key: P-Problem Set Lesson, M-Modeling Cycle Lesson, E-Exploration Lesson, S-Socratic Lesson

Topic A: Date: © 2013 Common Core, Inc. Some rights reserved. commoncore.org

Calculating and Interpreting Probabilities 3/20/14 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.

10

G7-M5-Topic Overview A.pdf

to represent a sample space by a tree diagram and use the tree to calculate probabilities of compound events. (7.SP.C.8). In Lesson 7, students calculate ...

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