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Normal Standardization

  1. Aug 28, 2009 #1
    Substrate concentration (mg/cm^3) of influent to a reactor is normally distributed with [tex]\mu = 0.30[/tex] and [tex]\sigma[/tex] = .06

    The question is how would you characterize the largest 5% of all concentration values?

    What does this mean?
     
  2. jcsd
  3. Aug 28, 2009 #2
    I think its probably P(X>=k) = 0.05, solve for k.
     
  4. Aug 28, 2009 #3
    P(X >= k) =0.05
    1- n = 0.05 n= 0.95 (Look up value in z-table)
    1.64 = 0.9495

    [tex]\frac{k - 0.30}{0.06}=0.9495[/tex]

    After solving, k = 0.36
     
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