Elementary Probability Rules Given two events A and B, basic probability rules can help us determine the probability of the union or intersection of the events.

Basic Probability Definitions a priori Probability: the probability that we determine from knowing the process by which the uncertain event happens (by logically examining existing information).

However, the mathematics of probability has rules that you can use in a much more disciplined way than guesswork to predict possible outcomes for your business plans. Understanding the importance ...

NPR's Madeleine Brand talks with NPR's Mike Pesca about his struggle to beat the odds in a Pepsi promotion to win an NFL hat. In the process, we learn a little bit about basics of probability.