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z= (20-30)/10z= -1p(z< -1) = 0.1587 = 15.87% I am stuck after I calculate z= -1

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Question

z= (20-30)/10z= -1p(z< -1) = 0.1587 = 15.87% I am stuck after I calculate z= -1 I do not know

what to do to get 0.1587. Can you explain that step.

 
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