andard deviation = $20. ) Draw a normal curve with the parameters labeled. ) Shade the region that represents the proportion of plans that charge less than $48. :) Suppose the area under the normal curve to the left of X = $48 is 0.1587. Provide an terpretation of this result. A. OB. C. 48. 48- O D. 68 88 108 28 48 68 28 68 108 48 68