Vermont is particularly beautiful in early October when the leaves begin to change color. At that time of year, a large proportion of cars on Interstate 91 near Brattleboro have out-of-state license plates. Suppose a Vermont state trooper randomly selects 50 cars driv- ing past Exit 2 on I- 91, records the state identified on the license plate, and calculates the proportion of cars with out-of-state plates. Which of the following describes the sampling distribution of the sample pro- portion in this context?