Probability & Two-Way Tables Basic Probability P(event) = favorable outcomes / total outcomes Two-Way Tables Rows and columns represent categories Marginal totals are the row/column sums Conditional probability: P(A|B) = P(A and B) / P(B) SAT Applications "Given that..." = conditional probability Read the table carefully — don't confuse row vs column totals Independence: P(A|B) = P(A) means events are independent