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Commercial fishermen in Alaska go into the Bering Sea to catch all they can of a particular species (salmon, herring, etc.) during a restricted season of a few weeks. The schools of fish move about in a way that is very difficult to predict, so the fishing in a particular spot might be excellent one day and terrible the next. The day-to-day records of catch size were used to discover that the probability of a good fishing day being followed by another good day is 0.5, by a medium day 0.3, and by a poor day 0.2. A medium day is most likely to be followed by another medium day, with a probability of 0.6, and equally like to be followed by a good or bad day. A bad day has a 0.3 probability of being followed by a good day, 0.2 of being followed by a medium day, and a 0.5 probability of being followed by another bad day. Construct a Markov chain model to describe the way the fishing days run.
Referring to problem 1 in Chapter 2 (the fishing problem – reproduced below), calculate what you need to answer the following questions:
- If the fishing is medium on Monday, what is the probability that it will be medium on Thursday?
- If yesterday’s fishing was bad, what is the expected number of days of good fishing over the new week (7 days)?
- What percentage of days over the long run are good fishing days?
- If the fishing is bad today, what is the expected time (in days) until it is good?
- If the fishing is bad today, how long (in expected number of days) will it remain bad before it gets better?
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