Recall that the standard normal distribution is a normal distribution with mean = 0 and standard deviation = 1. The number of standard deviations a value x falls from the mean is given by the z value, z = x . The standard normal curve is a symmetric bell-shaped curve with its highest point over the mean = 0. The area under the entire curve is 1. Here we need to first sketch the standard normal curve, locate z = 1.38, and then shade the interval under the curve that falls to the left of z = 1.38. The value z = 1.38 is 1.38 units to the ---Select--- of = 0. Draw a vertical line at this location and shade the area under the curve to the ---Select--- of the vertical line. Select the corresponding graph. A graph has a horizontal axis labeled z with values from 3.5 to 3.5. The curve enters the window from the left, just above the horizontal axis, goes up and to the right, changes direction over approximately 0 on the horizontal axis, and then goes down and to the right before exiting the window just above the horizontal axis. The area under the curve to the left of 1.38 is shaded. A graph has a horizontal axis labeled z with values from 3.5 to 3.5. The curve enters the window from the left, just above the horizontal axis, goes up and to the right, changes direction over approximately 0 on the horizontal axis, and then goes down and to the right before exiting the window just above the horizontal axis. The area under the curve to the right o