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# Probability

TermDefinition
Fundamental Principle of Counting If one task can be accomplished in m ways and a second task can be accomplished in n ways, then the first task followed by the second task can be accomplished in mxn ways
Permutation A way in which a number of things can be arranged
Combination A selection of objects chosen from a given set
Event A result we want from a number of outcomes
Sample Space A set of all possible outcomes
Mutually Exclusive Events Events that cannot occur together
Addition Law P(A or B)= P(A) + P(B)
Exhaustive Events A set of events containing all possible outcomes
Independent Events Events where the outcome of the first event doesn't affect the outcome of the second event
Multiplication Law(AND rule) P(A and B)= P(A) x P(B)
Conditional Probability The probability of an event being dependant on the previous event
P(A|B)= P(A and B)/P(B)
General Multiplication Law P(A and B)= P(A) x P(B|A) or P(B) x P(A|B)
Relative Frequency Number of successful trials/total number of trials (in decimal form)
Expected Frequecy Probability x Number of Trials
Created by: OscarE