If you wanted to know the cummulative probaibilty for Z1=-1.22 then, using the symmetry of the normal distribution, P(Z 1.22)=0.1112. The cummulative normal distribution is:F(Z1)=Integral(f(Z)dZ)=P(Z 1.22)=0.1112.If you wanted to know the value of the cummulative probability for Z1=1.22, that would be P(Z 1.22)=1-0.1112=0.8888.
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