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# probability - scms

### Probability - scms

experiment an activity in which results are observed
trial observation of an experiment
outcome a possible result of an experiment
sample space all possible outcomes of an experiment
event any set of one or more outcomes
probability a number from 0 to 1 (0% to 100%) that describes how likely an event is to occur
impossible an event that can never happen - probability is 0%
certain an event that is sure to happen - probability is 100%
experimental probability ratio of the number of times an event occurs to the total number of trials
theoretical probability ratio of the number of equally likely outcomes in an event to the total number of possible outcomes
equally likely outcomes that have the same probability
fair all outcomes of an experiment are equally likely
mutually exclusive two event that cannot occur in the same trial of an experiment
disjoint event two event that cannot occur in the same trial of an experiment
compound event an event made up of two or more simple events.
independent event events for which the outcome of one event does not affect the probability of the other
tree diagram a branching diagram that shows all possible combinations or outcomes of an event
Fundamental Counting Principles if one event has m possible outcomes and a second event has n possible outcomes after the first event has occured, then there are m.n total possible outcomes for the two events
Addition Counting Principles If one group contains m objects and a second group contains n objects, and the groups have no objects in common, then there are m+n total objects to choose from
Created by: susan.a.kesler