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80% of an airline's flights depart on-time and 20% do not. Of those that depart on-time, 95% arrive on-time. OF those that depart late, 10% arrive on-time. What is the chance of someone taking a flight that will arrive on-time?

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  1. arriving on time:
    Pr= (.8*.95+.2*.1)=
    calculate that, less than 80 percent

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  2. 0.78

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