You know a shortcut to a friend's house that usually takes 10 minutes off of the driving time. However, about once in every ten trips, the shortcut makes the trip 20 minutes longer. In terms of the amount of time the shortcut saves, what is the expected value of the shortcut? (10 minutes x 0.9) + (20 minutes x 0.1) (10 minutes x 0.1) + (-25 minutes x 0.9) 10 minutes (10 minutes x 0.9) + (-20 minutes x 0.1)