Suppose the monthly charges for cell phone plans are normally distributed with mean u= $63 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 $45. (c) Suppose the area under the normal curve to the left of X = $45 is 0.1587. Provide an interpretation of this result. (a) Choose the correct graph below. O B. Oc. OD. OA. 27 45 63 27 63 99 63 81 99 45 63 81

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