Probability

• We say that events are dependent if the outcome is affected by previous events.
• We determine the probability of an event by dividing the favourable outcome (the one we want to happen) by the possible outcomes.
• The sample space is all of the possible outcomes for an event.
• We say that an event is independent if the outcome is not affected by previous events.
• A tree diagram helps us to determine what the possible outcomes are of multiple events.
• theoretical probability is the probability that we calculate.
• To calculate the probability of an event:

  P= number of favourable outcomes ➗ by total number of possible outcomes
• Experimental probability is the probability that is determined after conducting a trial.
• Relative frequency is the number of times an outcome occurs ➗ total number of times experiment is conducted. Also known as experimental probability.