Probability What are your changes?

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Probability
Overview
Probability is the study of random events.
The probability, or chance, that an event will happen can be
described by a number between 0 and 1:
•A probability of 0, or 0%, means the event has no chance of
happening.
•A probability of 1/2 , or 50%, means the event is just as likely
to happen as not to happen.
•A probability of 1, or 100%, means the event is certain to
happen.
For instance, the probability of a coin landing heads up is ½, or
50%, This means you would expect a coin to land “heads up”
half of the time.
Overview
You can represent the probability of an event by
marking it on a number line like this one
Impossible
0 = 0%
50 – 50 Chance
½ , .5, 50%
Certain
1 = 100%
The language of probability includes:
•Experiment – a systematic investigation where the answer is unknown
•Trial – one specific instance of an experiment
•Outcome - the result of a single trial
•Event – a selected outcome, such as getting an 11 from rolling two dice
•Event Space/or Sample Space – the set of all possible outcomes of an experiment
Getting Started with Probability
To get an overview of probability, click on the
spinner and select the Introduction to Probability
lesson.
Read through the examples and take the quiz at the
end.
Make sure you are in slide show view
then CLICK on the spinner
Once you finish…
Complete Probability Worksheet

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