Question 391729
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Hi,         
Note: *Note: {{{z = blue(x - mu)/blue(sigma)}}}
  z = 38-36/2 = -2/2 = -1
 P(z<-1) = .1587 OR 15.87%  using Excel function NORMSDIST(-1)

{{{drawing(300,300,-5,5,-1,1,blue(line(-1,5,-1,-5)), graph( 300, 300,-5,5,-1,1,(1/sqrt(2*pi))*3^((-x^2/2)))) }}}