I need help understadning this question and how to get the answwer to it I have a hard time understanding the formula so if you guys can show it it will be greatly apperciated.

1.Find the proportion of scores that would lie in the tails of the following z scores:

a. z = 1.00

b. z = 0.50

c. z = -1.25

d. z= -0.40

2.Find each of the following probabilities for a normal distribution

a.p(z > 2.25)

b.p(z> -1.20)

c.p(z< 0.40)

d.p(z < -1.75)

3.Find each of the following probabilities for a normal distribution.

a.p( -1.80 < z < 0.20)

b.p( -0.42 < z < 1.40)

c.p( 0.25 < z < 1.25)

d.p( -0.90 < z < -0.60)