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Suppose the monthly charges for cell phone plans are normally distributed with mean mu equals $69 and standard deviation sigma
equals​ $17.
​(a) Draw a normal curve with the parameters labeled.
​(b) Shade the region that represents the proportion of plans that charge less than ​$52.
​(c) Suppose the area under the normal curve to the left of Xequals
​$52  is 0.1587. Provide an interpretation of this result. 

a. Choose the correct graph below.