Counting and Probability

Question	Answer
Sample Space	The set of all possible outcomes of an experiment. There are three types: list, tree diagram and two-way table
Probability Scale	Image: probability_scale (image/png)
Trial	Any particular performance of a random experiment, e.g. one roll of a die
Experiment	In probability work, an experiment is an activity or process where the result is unknown or uncertain, for example rolling a die or tossing a coin
Outcome	The result of an experiment
Event	Occurrence of one or more specified outcomes. If we are looking to land an even number on a die, rolling a 6 would be an example of an event
Relative Frequency = Experimental Probability	An estimate of the probability of an event occurring based on outcomes of trials already carried out Image: rel_freq (image/jpeg)
Fair = Unbiased	If all outcomes are equally likely to occur then the trial or experiment is considered to be fair or unbiased. For example, a fair die should land on heads around 50% of the time
Tree Diagram	Used to write down all possible combinations for two or more trials. Example below is for flipping a coin two times Image: tree_diagram (image/jpeg)

Resource summary

	Created by Culan O'Meara over 10 years ago

	Copied by chenchen wu almost 8 years ago