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 = - 1 plus the area under the normal curve to the right of sigma = 1 Find the area under the normal curve to the left of z=-0.27 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)