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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 0.0026 (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z= - 1.52 plus the area under the normal curve to the right of z = 2.52. The combined area is (Round to four decimal places as needed.)