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Probability distribution question

  1. Jun 9, 2014 #1
    1. The problem statement, all variables and given/known data

    http://postimg.org/image/bleosmrep/

    2. Relevant equations



    3. The attempt at a solution

    can someone explain the last line of the solution; where did 1 - 6.25/10^2 come from?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jun 9, 2014 #2

    Ray Vickson

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    You are supposed to show your work (PF rules). So, first you need to tell us what you think the method is.
     
  4. Jun 9, 2014 #3
    I'm not really sure what they're doing at all
    I want to know why they reduced the original problem to P((X-u)<10)
     
  5. Jun 9, 2014 #4

    jbunniii

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    Gold Member

    They're applying a standard inequality. What inequalities do you know which involve the mean and variance?
     
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