Joestat wants you to help you complete the following conditional probability example using your TI-84 and TI-83 calculator. What is the probability that someone drinks a diet given they drink coke. This is an example of conditional probability, so we will use the conditional probability formula.

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

Diet | 35 | 30 | 25 |

Regular | 40 | ? | 20 |

Solution:

First, add totals to the table:

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

Diet | 35 | 30 | 25 | 90 |

Regular | 40 | ? | 20 | 110 |

Total | 75 | 80 | 45 | 200 |

Second, use the Conditional Probability Formula:

| [ ( ] | [ 3 ] | [ 0 ] | [ / ] | [ 2 ] | [ 0 ] | [ 0 ] | [ ) ] | [ / ] | [ ( ] | [8 ] | [ 0 ] | [ / ] | [ 2 ] | [ 0 ] | [ 0 ] | [ ) ] | [Enter] |

Last Modified on September 7, 2013 by

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