Question 606542
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Hi,
*Note: {{{z = blue(x - mu)/blue(sigma)}}}
  z = (55-70)/12 = -1.25
P(z<-1.25) = .1057 or 10.57% will fall below 55 
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, 0,exp(-x^2/2)), blue(line( -1.25,0, -1.25,exp(-1.25^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}