# Probability

- Created by: eleanor
- Created on: 11-04-15 13:38

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- Probability
- P( event A or B or both) = P(A U B)
- P(Both event A and B) = P(A n B)
- P(not event A) = P(A')
- Venn diagrams
- Addition Rule P(A U B) = P(A) + P(B) -P(A n B)
- Given in Formula Book
- Addition Rule P(A n B) = P(A) + P(B) -P(A U B)

- Given in Formula Book
- Addition Rule P(A n B) = P(A) + P(B) -P(A U B)
- Conditional Probability P(A | B) = probability A happens given that B happens
- P(A|B) = P(A n B) / P(B)

- Multiplication Rule P(A n B) = P(A|B) x P(B)
- given in fomrula book

- mutually exclusive: if they have no outcomes in common so P(A n B) = 0
- so P(A U B) = P(A) + P(B)

- independant events: if the events do not affect each other so P(A|B) = P(A)
- P(A n B) = P(A) x (B)

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