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Math Help - Probability Question

  1. #1
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    Probability Question

    Hello!

    The excercise that I need help with is based on a study of a sporting-goods store in which it was found that out of 348 customers who parked in the store's parking lot, 287 made at least one purchase, whereas of 518 customers who did not use that lot, 305 made purchases.

    - Estimate the probability that the next customer who comes into the sporting-goods store will make at least one purchase.

    I'm not sure what to do here...maybe at 287 + 305 over 348 + 518? That's probably WAY off. Please help! Thank you!
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  2. #2
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    May 2006
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    Quote Originally Posted by luxdelux View Post
    Hello!

    The excercise that I need help with is based on a study of a sporting-goods store in which it was found that out of 348 customers who parked in the store's parking lot, 287 made at least one purchase, whereas of 518 customers who did not use that lot, 305 made purchases.

    - Estimate the probability that the next customer who comes into the sporting-goods store will make at least one purchase.

    I'm not sure what to do here...maybe at 287 + 305 over 348 + 518? That's probably WAY off. Please help! Thank you!
    This only works if the 348 and 518 customers that did/did-not use the parking lot are representative of the relative frequencies of parking lot usage of all customers. There is nothing in the question to suggest that this is the case, though you are probably expected to assume it is.

    .
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