P(Z<z0)=0.0250→z0=−1.96.P(Z<z_0)=0.0250\to z_0=-1.96.P(Z<z0)=0.0250→z0=−1.96.
P(Z<−1.96)=0.0250.P(Z<-1.96)=0.0250.P(Z<−1.96)=0.0250.
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