I 'uvvuvn I \"up V l * Deterrnine'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 = - 1 plus the area under the normal curve to the right of z = 1. The combined area is D. ' (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z = 1.53 plus the area under the normal curve to the right of z = 2.53. The combined area is D. (Round to four decimal places as needed.) (1:) Find the area under the normal curve to the left of 2: 0.26 plus the area under the normal curve to the right of z = 1.40. The combined area is D. (Round to four decimal places as needed.)