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Statistics - Probability

Pedestrian Walk Buttons New York City has 750 pedestrian walk buttons that work, and another 2500 that do not work (based on data from "For Exercise in New York Futility, Push Button," by Michael Luo, New York Times). If a pedestrian walk button is randomly selected in New York City, what is the probability that it works? Is the same probability likely to be a good estimate for a different city, such as Chicago?

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Total number of pedestrian walk buttons = 750 + 2500 = 3250

Probability that a randomly selected walk button ...

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