Ms. Garcia Math
	Probability	Show/Hide
	is the chance that an event will happen.
	The easiest way to get the probability of a condition is to list all possible outcomes, and count the ones that fit the condition.
	Tree diagrams	Show/Hide
	A tree diagram represents a sequence of events, showing all possible outcomes
	From the tree diagram, we could count all of the possible outcomes. The set of possible outcomes is: HH, HT, TH and TT # possible outcomes = 4
	Working out probabilies by counting	Show/Hide
	Once you have listed all possible outcomes, then you can work out the probabilities quite easily, counting the ones that fit the condition.	Example: What is the probability of flipping a coin 2 times and it coming up "heads" both times?
	Answer: # of favorable outcomes = 1, # of possible outcomes = 4, P(HH) = 1/4
	Counting Principle	Show/Hide
	if one event has m possible outcomes and a second independent event has n possible outcomes, then there are m x n total possible outcomes for the two events together.
	Flip a coin and roll a die	Show/Hide
	There are 2 ways that you can flip a coin and 6 ways that you can roll a die. There are then 2x6=12 ways that you can flip a coin and roll a die.