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Statistics, Probability, OR equation

  1. Jul 6, 2011 #1
    1. The problem statement, all variables and given/known data

    An appliance store purchases electric ranges from two companies. From company A, 600 ranges are purchased, and 5% are found to be defective. From company B, 300 ranges are purchased, and 8% are found to be defective. Given that a range is defective, find the probability that it came from company A.

    2. Relevant equations

    (work shown below) use "OR" equation

    3. The attempt at a solution

    (600)(.5) - (300)(.8) = 60
  2. jcsd
  3. Jul 6, 2011 #2
    your answer is wrong..

    use bayes theorem
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