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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).…

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P(A') = the probability of not A. The probability that A doesn't
happen.

P(A) + P(A') = 1

The addition rule is the P(A B) = P(A) + P(B) ­P(A B)

The multiplication rule is P(A B) = P(A|B) x P(B)
or P(A B) = P(B|A) x P(A)

This can…

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