Question

Find the standard normal area for each of the following, showing your reasoning clearly.
a. P(1.22<z<2.15)
b. P(2.00<z<3.00)
c. P(-2.00<z<2.00)
d. p(z=0.50)

Answer 1

a good place for playing around with Z table stuff is

http://davidmlane.com/hyperstat/z_table.html

Answer 2

how do I use it?

Answer 3

Wow - you must give up easy.

For #a, click the Between button and enter the two values. Then click recalculate. It will show the relevant area and its probability: .0955

If you know the area and want the bounds, then click on the Value from an Area button.