Find the area under the standard normal curve to the left of the following Z-values. Round your answers to at least four decimal places. (a) Find the area under the standard normal curve to the left of z = 0.56. (b) Find the area under the standard normal curve to the left of z = 1.58. (c) Find the area under the standard normal curve to the left of z = -0.44. (d) Find the area under the standard normal curve to the left of z = - 2.17