Probability Scale, A way to show how likely things are, from 0 (impossible) to 1 (certain)., Certain, This event will always happen., Likely, This event will usually happen., Equal/Even Chance, This event has the same chance of happening or not happening., Unlikely, This event will usually not happen, but still possible., Impossible, This event will never happen., Tree Diagram, A diagram that shows all possible outcomes of an event step by step., Trial, Each time we do something to see what happens. An attempt at generating a result., Experiment, A series of trials done to observe different results., Outcome, One possible result of a trial., Sample Space, All possible outcomes of an experiment., Event, A group of outcomes., Theoretical Probability, The calculated probability of an event. , Experimental Probability, The measured probability of an event. The probability based on what actually happens when you try it., Pr(event), A variable representing the probability of an event..

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