An Employee's Office Window Overlooks a Busy Four-Way Stop, and the Employee

question 18

Multiple Choice

An employee's office window overlooks a busy four-way stop, and the employee decides to track, per minute, the number of drivers who fail to stop. From data taken over many randomly selected times, the employee gets this probability model:

In Question 14, the employee found the expected number of drivers failing to stop, per minute. The law of large numbers says:

• A) observe whether each of many drivers fails to stop. The proportion who fail to stop will be close to the number calculated in the previous question.
• B) if five observations of failure to stop are made in a row, the next several observations are likely to have four or five drivers failing to stop because the average must stay close to the expected value.
• C) the expected value is correct only in a randomized comparative experiment.
• D) probabilities can be found by simulation.
• E) many observations should be made and the number of drivers failing to stop should be recorded in each case. The average will be close to the number calculated in the previous question.

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