Probability is the likelihood or chance of a specific event happening. It is expressed as a number between 0 and 1, where 0 indicates that the event will not happen and 1 indicates that the event will definitely happen.

To calculate the probability of an event, you use the following formula:

Probability = Number of favorable outcomes / Total number of possible outcomes

For example, if you want to calculate the probability of rolling a 6 on a standard six-sided die, there is 1 favorable outcome (rolling a 6) out of 6 possible outcomes (rolling a number from 1 to 6). So the probability would be 1/6.

Probability is used in everyday life to make decisions and predictions. For example, weather forecasts use probability to predict the likelihood of rain or sunshine on a given day. Similarly, businesses use probability to assess risks and make financial decisions.

There are different types of probability, including:

**Theoretical Probability:**This is based on what should happen under ideal conditions. For example, the theoretical probability of flipping a coin and getting heads is 1/2.**Experimental Probability:**This is based on actual outcomes from an experiment or real-life situation. For example, if you roll a fair six-sided die 100 times and get 20 sixes, the experimental probability of rolling a six would be 20/100 or 1/5.**Conditional Probability:**This is the probability of one event occurring given that another event has already occurred. For example, the probability of drawing a red card from a deck of cards, given that a black card has already been drawn.

Understanding probability is important for making informed decisions and interpreting the likelihood of different outcomes in various situations.

Study GuideProbability Worksheet/Answer key

Probability Worksheet/Answer key

Probability Worksheet/Answer key

Probability Worksheet/Answer keyChance Worksheet/Answer keyChance Worksheet/Answer keyProbability Worksheet/Answer keyChance Worksheet/Answer keyChance

Data Analysis and Probability (NCTM)

Develop and evaluate inferences and predictions that are based on data.

Discuss events related to students' experiences as likely or unlikely.