Chapter14

Chapter14 - Chapter 14 From Randomness to Probability...

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Chapter 14 From Randomness to Probability

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Dealing with Random Phenomena Every day you drive through Washington Avenue to get into Collins Circle. Even though it may seem that the light is always red when you get there, you know this can’t really be true. In fact, you can recall just sailing through the green light once in a while.
What’s random here? Even if you try to leave your house at exactly the same time every day, whether the light is red or green as you reach the intersection is a random phenomenon.

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Accumulated Percentage You might record what happens at the intersection each day and graph the accumulated percentage of red lights like the following slide: (Note: It only shows up to 6 days but the graph does go further)
Simulation of Light Colors Day Light % Red 1 Red 100 2 Green 50 3 Red 66.7 4 Red 75 5 Green 60 6 Green 50

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Accumulated Percentage Graph Overall % of Red Lights 0 20 40 60 80 100 120 1 2 3 4 5 6 Day % Red Series1
Probability If you were asked for the probability that you

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