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Homework Help: Area between z scores?

  1. Jun 28, 2010 #1
    1. The problem statement,
    The probability of a defective bolt is 1/10. Find the standard deviation of defective bolts of a normally distributed set of 400 bolts.
    and given/known data
    Mean = 40 bolts
    2. The attempt at a solution
  2. jcsd
  3. Jun 28, 2010 #2


    Staff: Mentor

    Per the forum rules, you must make an attempt at a solution.
  4. Jun 28, 2010 #3
    I can't even think of one, but I'll post one as soon as I can.
  5. Jun 28, 2010 #4
    Oooohhhh, wrong title. Argh.
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