Suppose the monthly charges for cell phone plans are normally distributed with mean p, = $69 and standard deviation 0' = $19. (a) Draw a normal curve with the parameters labeled. (b) Shade the region that represents the proportion of plans that charge less than $50. (c) Suppose the area under the normal curve to the left of X = $50 is 0.1587. Provide an interpretation of this result. OA. OB. OC. a a a a I3 IS.' 69 88 107 50 69 88 31 50 69 (b) Choose the correct graph below. 0 A. O B. O c. a a a a 50 m a X X 69 88 107 50 69 88 31 50 69 9,0 9,0 I3 31 50 31 69 107 69 107 [0,0 IS.' [0,0 (b) Choose the correct graph below. O A. O B. O c. O D. 50 X X A X X 69 88 107 50 69 88 50 69 31 69 107 (c) Select the correct choice below and fill in the answer box to complete your choice. (Type a whole number.) O A. The probability is 0.1587 that a randomly selected cell phone plan in this population is more than $ per month. O B. The probability is 0.1587 that a randomly selected cell phone plan in this population is less than $ per month