Question 8.103

image 72. Although cities encourage carpooling to reduce traffic congestion, most vehicles carry only one person. For example, 70% of vehicles on the roads in the Minneapolis-St. Paul metropolitan area are occupied by just the driver. You choose 84 vehicles at random.

  1. What are the mean and standard deviation of the proportion of vehicles in your sample that carry only one person? (See Chapter 7, Sampling Distribution of a Sample Proportion, page 317.)
  2. What is the probability that more than 60% of the vehicles in your sample carry only one person?