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 0027 (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z = - 1.57 plus the area under the normal curve to the right of z = 2.57. The combined area is 0633 (Round to four decimal places as needed.) (c) Find the area under the normal curve to the left of z= -0.25 plus the area under the normal curve to the right of z= 1.20. The combined area is (Round to four decimal places as needed.)

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