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WTVX, Channel 6, is located in Eugene, Oregon, home of the University of Oregon’s football team. The station was owned and operated by George Wilcox, a former Duck (University of Oregon football player). Although there were other television stations in Eugene, WTVX was the only station that had a weatherperson who was a member of the American Meteoro- logical Society (AMS). Every night, Joe Hummel would be introduced as the only weatherperson in Eugene who was a member of the AMS. This was George’s idea, and he believed that this gave his station the mark of quality and helped with market share.
In addition to being a member of AMS, Joe was also the most popular person on any of the local news programs. Joe was always trying to find innovative ways to make the weather in- teresting, and this was especially difficult during the winter months when the weather seemed to remain the same over long periods of time. Joe’s forecast for next month, for example, was that there would be a 70% chance of rain every day, and that what happens on one day (rain or shine) was not in any way de- pendent on what happened the day before.
One of Joe’s most popular features of the weather report was to invite questions during the actual broadcast. Questions
(c) exactly 3 (d) exactly 6 (e) less than 2
2-57 In the Arnold’s Muffler example for the exponential distribution in this chapter, the average rate of serv- ice was given as 3 per hour, and the times were ex- pressed in hours. Convert the average service rate to the number per minute and convert the times to min- utes. Find the probabilities that the service times will be less than 1/2 hour, 1/3 hour, and 2/3 hour. Com- pare these probabilities to the probabilities found in the example.
would be phoned in, and they were answered on the spot by Joe. Once a 10-year-old boy asked what caused fog, and Joe did an excellent job of describing some of the various causes.
Occasionally, Joe would make a mistake. For example, a high school senior asked Joe what the chances were of getting 15 days of rain in the next month (30 days). Joe made a quick calcula- tion: 170%2 * 115 days>30 days2 = 170*1 2B = 35%. Joe quickly found out what it was like being wrong in a university town. He had over 50 phone calls from scientists, mathemati- cians, and other university professors, telling him that he had made a big mistake in computing the chances of getting 15 days of rain during the next 30 days. Although Joe didn’t understand all of the formulas the professors mentioned, he was determined to find the correct answer and make a correction during a future broadcast.
1. What are the chances of getting 15 days of rain during the next 30 days?
2. What do you think about Joe’s assumptions concerning the weather for the next 30 days?
WTVX, Channel 6, is located in Eugene, Oregon, home of the University of Oregon’s football team. The station was owned and operated by George Wilcox, a former Duck (University of Oregon football player). Although there were other television stations in Eugene, WTVX was the only station that had a weatherperson who was a member of the American Meteoro- logical Society (AMS).