Determine the total area under the standard normal curve in parts (a) through (c) below. (a) Find the area under the normal curve to the left of z = - 3 plus the area under the normal curve to the right of z = 3. 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= -0.28 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.)