Suppose the monthly charges for cell phone plans are normally distributed with mean u = $55 and standard deviation o = $19. (a) Draw a normal curve with the parameters labeled. (b) Shade the region that represents the proportion of plans that charge less than $36 (c) Suppose the area under the normal curve to the left of X = $36 is 0.1587. Provide an interpretation of this result. . . . (a) Choose the correct graph below. O A. O B. O c. OD. O O X A X A X A X 55 74 93 17 36 55 36 55 74 17 55 93