John can take either of two routes (A or B) to LAX airport. At midday on a

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John can take either of two routes (A or B) to LAX airport. At midday on a typical Wednesday the travel time on either route is normally distributed with parameters μA = 54 minutes, σA = 6 minutes, μB = 60 minutes, and σB = 3 minutes.
(a) Which route should he choose if he must be at the airport in 54 minutes to pick up his spouse?
(b) Sixty minutes?
(c) Sixty-six minutes? Explain carefully.
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