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Which game are you more likely to win? Explain your reasoning.
Game 1: You flip a coin and win if it lands showing heads.
Game 2: You roll a standard number cube and win if it lands showing a number that is divisible by 3.
For each chance experiment, list the sample space and tell how many outcomes there are.
Clare spins this spinner once.
Next, compare the likelihood of these outcomes. Be prepared to explain your reasoning.
Your teacher will give your group a bag of paper slips with something printed on them. Repeat these steps until everyone in your group has had a turn.
| Guess the sample space. |
What is printed on the paper? |
|
|---|---|---|
| person 1 | ||
| person 2 | ||
| person 3 | ||
| person 4 |
The probability of an event is a measure of the likelihood that the event will occur. Probabilities are expressed using numbers from 0 to 1.
If we list all of the possible outcomes for a chance experiment, we get the sample space for that experiment. For example, the sample space for rolling a standard number cube includes six outcomes: 1, 2, 3, 4, 5, and 6. The probability that the number cube will land showing the number 4 is . In general, if all outcomes in an experiment are equally likely and there are possible outcomes, then the probability of a single outcome is .
Sometimes we have a set of possible outcomes and we want one of them to be selected at random. That means that we want to select an outcome in a way that is based on chance. For example, if two people both want to read the same book, we could flip a coin to see who gets to read the book first.
The probability of an event is a number that tells how likely it is to happen. A probability of 1 means the event will always happen. A probability of 0 means the event will never happen.
For example, the probability of selecting a moon block at random from this bag is .
An outcome of a chance experiment is random if it cannot be predicted. For example, the result of rolling a standard number cube is random because it could result in 1, 2, 3, 4, 5, or 6, and nobody can know which value it will be until it is rolled.
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 |