The length of a movie file that is available for streaming is modeled using the normal distribution shown below. The mean of the distribution is 189.7 min and the standard deviation is 20.2 min. In the figure, there are three missing values to fill in along the axis. The middle value is under the highest part of the curve. And, the left and right values are each the same distance away from the middle value. Use the empirical rule to choose the best value for the percentage of the area under the curve that is shaded, and fill in the missing values along the axis. Percentage of total area shaded: 68% X ? 120 140 160 180 189.7 200 220 240 260 Time (in min )