Friday, February 8, 2013

Introduction to Probability

Probability... What's it all about?


Have you ever flipped a coin, rolled a dice, or spun a spinner?  Ever thought of what the chance of rain or sunshine is for the day?  These are all examples of probability

By definition:  Probability is the likelihood that a particular event will occur
* number of outcomes is compared to the total number of outcomes.

How are probabilities are determined: We start with an experiment; an activity whose results can be observed and recorded.  Then we look at all the possible outcomes that could come from the experiment.  When rolling a die, what are the chances of rolling a 4?  This is an example of an outcome or a possible result of an experiment.  The sample space is a set of all possible outcomes for an experiment.  So when rolling a die, the sample space is S= 1,2,3,4,5,6. 

Types of Probability:
Experimental (empirical) -  result of an observation where the numbers are unique to each experiment Ex. a spinner with different number increments
Theoretical - can be found mathematically without an experiment and the results will not vary 
Ex. tossing a fair coin, results are heads/tails

http://www.free-training-tutorial.com/probability-games.html
Above is a link for free online educational games.  I played the probability game and it was basic practice of introductory probability.



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