# probability

- Created by: Rebeccaxxxx
- Created on: 03-04-20 12:50

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- Probability
- expressions of probability
- fraction
- decimal
- percentage

- experimental probability
- relative frequency = number of favourable outcomes / total number of trials
- relative frequencies are probabilities based on experiments

- relative frequency = number of favourable outcomes / total number of trials
- theoretical probability
- number of favourable outcome / total number of outcomes

- probability of an event not happening
- the probability of an event + probability of event not happening=1

- mutually exclusive events
- cannot happen at the same time

- tables or frequency trees can be used to show all outcomes and data about them
- Probability is the likelihood or chance of an event occurring. Probability = the number of ways of achieving success. the total number of possible outcomes.
- events
- certain
- p=1

- impossible
- p=0

- likely
- unlikely

- certain
- combined events
- when >=2 events happen at the same time

- Venn diagrams
- show mathematical relationship between sets of data
- ? means is an element of a set
- { } are used to list members of a set
- A ? B = intersection = the set of all elements that are in both set A and B
- A ? B = union = set of all elements that are in either set A or set B or in both sets

- expressions of probability

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