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Homework Help: Statistic problem

  1. Oct 2, 2007 #1
    1. The problem statement, all variables and given/known data

    when checking tire tread depth at an automobile repair ship, it has been determined that if a tire has low air pressure, there is a 22% probability that its tread depth is less than 1/8 of an inch. on a given day 75 out of 100 tires were found to have a tread depth greater than 1/8 of an inch. how many tiras had low air pressure?

    2. Relevant equations

    3. The attempt at a solution

    thank for the help....
  2. jcsd
  3. Oct 2, 2007 #2


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    So 25 tires had less than 1/8 of an inch, and clearly they have low pressure.

    Then "22% probability that its tread depth is less than 1/8 of an inch" of the population of low pressure tires.
  4. Oct 2, 2007 #3


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    Homework Helper

    This seems like a conditional probability question. Have you had any thoughts on the problem?
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