On a certain television channel, 18% of commercials are local advertisers. A sample of 120 commercials is
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On a certain television channel, 18% of commercials are local advertisers. A sample of 120 commercials is selected.
a. What is the probability that more than 20% of the commercials in the sample are local advertisers?
b. Would it be unusual for more than 25% of the commercials to be local advertisers?
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