# Probability revision sheet

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```					Probability Method Sheet

Exhaustive events

One of the events must happen.

When rolling a dice a 1, 2, 3, 4, 5, or 6 will be the outcome.

Independent events

Two events are independent when one has no influence over the occurrence of the other.

An example could be which card I choose at random from a pack of cards and whether it
is raining outside.

Mutually exclusive events

These are events which cannot happen at the same time. An example would be rolling a
single die once the two events of getting a six and getting a two at the same time is not
possible.

Conditional events

Probability that event B will occur given that event A has already occurred.

Tree diagrams

These are an easy way to work out probabilities. They consist of points for each event
and branches for each outcome.

Bridging to Level 5 Maths            Probability Methods Sheet                       1

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