Question 429671
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Hi
 z = -.5244 is the z-score corresponding to the 30%
{{{drawing(400,200,-5,5,-.5,1.5, graph(400,200,-5,5,-.5,1.5, exp(-x^2/2)), green(line(-.5244,0,-.5244,exp(-.5244^2/2))),locate(4.8,-.01,z),locate(4.8,.2,z))}}}