Find the area under the standard normal curve that lies

a. either to the left of −0.39 or to the right of 2.55.

b. either to the left of −2.87 or to the right of −0.39.

2 −1 1 2 3 z

a. Determine the area of each region.

b. Complete the following table.
Percentage of Region Area total area −∞ to −3 0.0013 0.13 −3 to −2 −2 to −1 −1 to 0 0 to 1 0.3413 34.13 1 to 2 2 to 3 3 to ∞
1.0000 100.00