# S1 Statistics Revision - Chapter 5 Notes

Chapter 5 - Probability

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- Created by: Megan Wilkinson
- Created on: 17-05-12 19:09

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AS Statistics Revision

Statistics 1 Chapter 5

Probability

Key points to remember

If p is a probability then 0 p 1.

Sample space = all possible outcomes.

Event = set of possible outcomes.

P(A B) = the probability of both A and B, (The intersection of

A

and B). In this event, both A and B occur

P(A B) = the probability of A or B or both, (The union of A

and

B). P(A) + P(B) P(A B).

P (A|B) = the probability of A given that B has happened. This

is

called the conditional probability.

Here, the probability would be the total of the highlighted bit,

out of the total of the bold circle so, (3 ÷ 11) written as a

fraction.

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