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Statistics Standard Deviation Problem

  1. Sep 23, 2010 #1
    1. The problem statement, all variables and given/known data
    A jet engine manufacturer estimates that the chance of a “critical-item” failure within a jet engine’s afterburner module is approximately 1 in 220. What is the standard deviation of the number of launches, before a “critical-item” failure occurs within a jet engine’s afterburner module?


    2. Relevant equations

    I would guess that you would use the standard deviation equation, but im not really understanding what to use when they give you "1 in 120"
    Please Help?
     
  2. jcsd
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