Calculating Probabilities Flashcards

The likelihood of an event occurring, expressed as a fraction, decimal, or percentage.

Probability = Number of favourable outcomes / Total number of possible outcomes.

An event with a probability of 1 (it is guaranteed to happen).

An event with a probability of 0 (it cannot happen).

Events that cannot happen at the same time. P(A or B) = P(A) + P(B).

Two events where the sum of their probabilities is 1. P(A') = 1 - P(A).

A diagram used to show all possible outcomes of an event and their probabilities.

Events where the outcome of one does not affect the outcome of the other. P(A and B) = P(A) × P(B).

An estimate of probability based on experiments: Relative frequency = Number of successful outcomes / Total number of trials.

The number of times an event is expected to occur: Expected frequency = Probability × Number of trials.