math 431 uw madison probability formulas cheat sheet math 431
math 431 uw madison
 1) basics a) for every event you have a set, or space, of possible outcomes called the sample space: ω i) you get probabilities from subsets of the sample space b) for every event the probability measure is somewhere between 0 and 1 i) the probability for the whole space is, and the probability for the empty set is 0 c) set theory i) for set a inside ω, the compliment of a is all of ω that is not part of a ii) the union of sets a and b, aub, is all of what is contained in a, and all of what is contained in b iii) the intersection of a and b, a∩b, is what in bot a and b iv) the probability of a set and its compliment add to one v) the cardinality: #, of