# probability notes

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- Created by: louisepardoe
- Created on: 12-06-16 10:41

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**Probability basics**

all probabilities are between 0 and 1

- the higher the probability of something, the more likely it is
- a probability of 0 means it will never happen
- a probability of 1 means it definitely will happen

you can find some probabilities using a formula

- the following formula only works if all the possible results are equally likely
- number of ways for something to happen / total number of possible results

probabilities add up to 1

- if only one possible result can happen at a time, then the probabilities of all the results add up to 1
- P(event happens) + P(event doesn't happen) = 1

**Listing outcomes and expected frequency**

listing all outcomes: 2…

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