Joestat wants you to calculate the probability that Bob favorite drink is Diet or Pepsi? This could also be thought of as the union between diet and Pepsi.

Results from the Favorite Beverage Survey from Bob’s Class |
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Pepsi | Coke | Other | |

Diet | 35 | 30 | 25 |

Regular | 40 | 50 | 20 |

Solution:

First, add totals to the table:

Results from the Favorite Beverage Survey from Bob’s Class |
||||

Pepsi | Coke | Other | Total | |

Diet | 35 | 30 | 25 | 90 |

Regular | 40 | 50 | 20 | 110 |

Total | 75 | 80 | 45 | 200 |

Second, use the Probability Union Formula:

P(A or B) = P(A) + P(B) – P(A and B)

P(Pepsi or Diet) = P(Pepsi)+ P(Diet) – P(Pepsi and Diet)

| [ 7 ] | [ 5 ] | [ / ] | [ 2 ] | [ 0 ] | [ 0 ] | [ + ] | [ 9 ] | [ 0 ] | [ / ] | [ 2 ] | [ 0 ] | [ 0 ] | [ – ] | [ 3 ] | [ 5 ] | [ / ] | [ 2 ] | [ 0 ] | [ 0 ] | [Enter] |

###### Congratulations, you have successfully completed the Probability Union TI-84 | TI-83 example problem.

Last Modified on September 7, 2013 by

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