What Cashiers Do About this section Cashiers process returns and exchanges of merchandise. Cashiers process payments from customers purchasing goods and services.
Statistics and Probability Dictionary. Select a term from the dropdown text box. The online statistics glossary will display a definition, plus links to other related web pages. Select term: Conditional Probability. The probability that event A occurs, given that event B has occurred, is called a conditional probability. The conditional probability of A, given B, is denoted by the symbol P(A|B).
Below, we formally provide the formula and then explain the intuition behind it. If $A$ and $B$ are two events in a sample space $S$, then the conditional probability of $A$ given $B$ is defined as $$P(A|B)=\frac{P(A \cap B)}{P(B)}, \textrm{ when } P(B)>0.$$. Here is the intuition behind the formula. When we know that $B$ has occurred, every outcome that is outside $B$ should be discarded.