Ms. Garcia Math
	Probability	Show/Hide
	The probability of event A is the number of ways event A can occur divided by the total number of possible outcomes.
	Events mutually exclusive	Show/Hide
	Two events are mutually exclusive if, when one event occurs, the other cannot, and vice versa.
	Example: Tossing a coin once. Can result in either heads or tails, but not both.
	Complementary event	Show/Hide
	The complement of any event A is the event [not A]
	Example: Turning a Head and Turning a Tail are complementary events.
	P(A) + P(Not A) = 1	Show/Hide
	The probabilities of two complementary events add up to 1 .	P(Head) + P(Tail) = ½ + ½ = 1
	Simple event	Show/Hide
	An event that cannot be decomposed is called a simple event.
	Example: rolling a 6 on a die has the probability of 1/6
	Compound event	Show/Hide
	Are the combination of multiple simple events
	Example: rolling an even number on a die has the probability of 3/6
	P(even) = P(2 or 4 or 6) = 3/6 = 1/2
	Adding probabilities	Show/Hide
	If two events have no outcomes in common, the probability that one or the other occurs is the sum of their individual probabilities.
	P(2 or 4 or 6) = 1/6 + 1/6 + 1/6 = 3/6