4) Elizabeth waited for 6 minutes at the drive thru at her local McDonald's last time she visited. She was
upset and decided to talk to the manager. The manager assured her that her wait time was very
unusual and that it would not happen again. A study of customers commissioned by this restaurant
found an approximately normal distribution of results. The mean wait time was 226 seconds and the
standard deviation was 38 seconds. Given these data, and using a 95% level of confidence, was
Elizabeth's wait time unusual? Justify your answer.