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A study of 20 Canadian cities finds that half of them are polluted. Six of the...

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Statistics

A study of 20 Canadian cities finds that half of them arepolluted. Six of the 20 cities are selected at random, withoutreplacement, for closer study.

(a) What is the probability that at least 3 are polluted?

(b) What is the probability that none are polluted?

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