Using calculator find the following probabilities:

1. P(-.60 z 0)

2. P(-1.54 z 1.75)

3.P(-.20 z -.50)

Find z_o for the following probabilities:

1. P(z z_o) = 0.25

2. P(z z_o) = 0.3

3. P(-z_o z 0) = 0.15