The following is a graph of two normal distributions plotted on the same x-axis. A 1 9 13 Based on the graph above, which statement best describes the graph? The two distributions have means that differ by 4 units and equal standard deviations. The two distributions have means that differ by 4 units and different standard deviations. The two distributions have equal means and equal standard deviations. The two distributions have equal means and standard deviations that differ by 4 units