Edward C. answered 03/11/15
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Caltech Grad for math tutoring: Algebra through Calculus
In N(0,1) the N stands for Normal Distribution, 0 is the mean μ, and 1 is the variance s2 ==> s = 1. The other thing you need to know is that N(0,1) is symmetric about 0 so P(Z<0) = 0.5.

Susan C.
03/12/15