P ( -2.81 < z < 0 )
P(−2.81<z<0)=Φ(0)−Φ(−2.81)=0.5−0.00248=0.49752P\left( -2.81<z<0 \right) =\varPhi \left( 0 \right) -\varPhi \left( -2.81 \right) =0.5-0.00248=0.49752P(−2.81<z<0)=Φ(0)−Φ(−2.81)=0.5−0.00248=0.49752
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