Determine the total area under the standard normal curve in parts (a) through (c) below. quiz (a) Find the area under the normal curve to the left of z=-2 plus the area under the normal curve to the right of z=2. The combined area is (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z=-1.54 plus the area under the normal curve to the right of z = 2.54. The combined area is (Round to four decimal places as needed.) (c) Find the area under the normal curve to the left of z = -0.29 plus the area under the normal curve to the right of z=1.10. The combined area is (Round to four decimal places as needed.)