This lesson is optional because it revisits below grade-level content learned in grade 7 about chance events and probability. If the pre-unit diagnostic assessment indicates that your students know this material, this lesson may be safely skipped. The mathematical purpose of this lesson is to revisit the idea of chance events and the concept of probability. The probability of a chance event is a number between 0 and 1 that expresses the likelihood of the event occurring. The work of this lesson connects to previous work because students investigated chance processes and developed, used, and evaluated probability models in Grade 7. The work of this lesson connects to upcoming work because students will understand independence and conditional probability and use them to interpret data. The Which One Doesn’t Belong activity gives students a reason to use language precisely (MP6) and gives the opportunity to hear how they use terminology and talk about characteristics of the items in comparison to one another.
- Compare (orally and in writing) probability models and observed frequencies.
- Determine (in writing) whether a given situation involving probability is a chance experiment.
- Let’s explore chance.
- I can find or estimate probability using a model or data from a chance experiment.
- I can identify chance experiments.
A chance experiment is something you can do over and over again, and you don’t know what will happen each time.
For example, each time you spin the spinner, it could land on red, yellow, blue, or green.
An event is a set of one or more outcomes in a chance experiment. For example, if we roll a number cube, there are six possible outcomes.
Examples of events are “rolling a number less than 3,” “rolling an even number,” or “rolling a 5.”
An outcome of a chance experiment is one of the things that can happen when you do the experiment. For example, the possible outcomes of tossing a coin are heads and tails.
The probability of a chance event is a number from 0 to 1 that expresses the likelihood of the event occurring, with 0 meaning it will never occur and 1 meaning it will always occur.
The sample space is the list of every possible outcome for a chance experiment.
For example, the sample space for tossing two coins is:
heads-heads tails-heads heads-tails tails-tails
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