STAT 110
Chapter 18 and 19 Definitions
probability model – describes all possible outcomes and says how to assign probabilities
to any collection of outcomes
sample space – collection of unique outcomes of a random circumstance
event – a collection of outcomes
Probability Rules
1. Any probability is a number between 0 and 1.
2. All possible outcomes together must have probability 1.
3. The probability that an event does not occur is 1 minus the probability that the event
does occur.
4. If two events have no outcomes in common, the probability that one or the other occurs
is the sum of their individual probabilities.

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