Monthly charges for cell phone plans in the United States are normally distributed with mean µ = +62 and standard deviation σ = +18.
(a) Draw a normal curve with the parameters labeled.
(b) Shade the region that represents the proportion of plans that charge less than $44.
(c) Suppose the area under the normal curve to the left of x = +44 is 0.1587. Provide two interpretations of this result.