SOCI 3311 Blog

First read the area to the left of z = -2.00. You can do this using the STANDARD NORMAL CURVE calculator. Enter -2 for one of your two z scores. Technically, your second z score is infinity. However, you cannot enter infinity into the calculator. Since virtually 100% of area lies between z = -4 and z = 4, enter any z value smaller than -4 (e.g. -5, -10, -50 etc).

Since the curve is symmetrical, the area to the right of z = 2 is the same. You can confirm this by using the same calculator. Enter 2 as one of your two z scores and any number larger than 4 as the second z score (e.g. 5, 10, 50, etc).

Now add these two areas together.