You must draw (or indicate direction of shading) for each problem

Determine each of the following probabilities:

a)P( z < 0.10)

b) P(-0.40 < z < 0.85)

c) P( z > -1.25)

d) P( z < -1.50 or z > 2.50)

*** what does "z" mean/ how do i find it?