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# Unit 1: Probability

### vocabulary for Unit 1: Outcomes and Likelihoods

When the results of one event do not affect another (such as flipping a coin and spinning a spinner) independent events
all possible outcomes of an experiment sample space
more than one simple event compound event
used to organize possible outcomes sequentially tree diagram
when actual events take place to determine outcomes (i.e., a number cube is rolled, or a spinner is spun, or a coin is flipped) experimental probability
used when more than one outcome is desired (example -- probability for rolling a two or a three on a number cube: 1/6 + 1/6 = 2/6) addition principle
all possible outcomes of an event that are NOT desired complement
consisting of just one outcome simple event
The chances of events happening as determined by calculating results that would occur under ideal circumstances theoretical probability
If an event A can occur in m ways and for each of these m ways, an event B can occur in n ways, then events A and B can occur in m ∙ n ways counting principle
The number of times an outcome occurs divided by the total number of trials relative frequency
To find the probability that two independent events (A and B) occur, multiply their individual probabilities multiplication principle
Created by: rcollins