Suppose the monthly charges for cell phone plans are normally distributed with mean p = $57 and standard deviation o = $18. (a) Draw a normal curve with the parameters labeled. (b) Shade the region that represents the proportion of plans that charge less than $39. (c) Suppose the area under the normal curve to the left of X = $39 is 0.1587. Provide an interpretation of this result. O A. O B. O C. OD. X X X 39 57 75 X 21 57 93 21 39 57 57 75 93 (b) Choose the correct graph below. O A. O B. O C. OD. 39- X 39 X X 21 39 57 X 21 57 93 39 ' 75 57 75 93 (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