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13.1 Introduction to ProbabilityObjective: Write probabilities.Mr. Williams         jwilliams@gesd40.org

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Tossing a Coin = An Experiment

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Outcome ­ a possible result of an experiment.

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Favorable Outcomes ­ an outcome you 

specify.

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Probability = Number of Favorable OutcomesNumber of Possible Outcomes

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P = 0                         P = 0.25                                          P = 0.5                                           P = 0.75                               P = 1

 Impossible                 Unlikely                                        Half the time                                   Likely                               Certain

You can write probabilities as Fractions, Decimals, or Percents.

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Rolling an odd number.

P =          =            =

Fraction Decimal Percent

Impossible     Unlikely     Half     Likely     Certain

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Rolling a whole number.

P =          =            =

Fraction Decimal Percent

Impossible     Unlikely     Half     Likely     Certain

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Rolling a seven.

P =          =            =

Fraction Decimal Percent

Impossible     Unlikely     Half     Likely     Certain

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Rolling a number less than 3.

P =          =            =

Fraction Decimal Percent

Impossible     Unlikely     Half     Likely     Certain

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Work with your group to solve problems 1 & 2 on page 631.

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