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Bernie Belfry, the coordinator for Habitat for Humanity, wants to know the percentage of the population living in substandard housing. Belfry wants to be 99%

Bernie Belfry, the coordinator for Habitat for Humanity, wants to know the percentage of the population living in substandard housing. Belfry wants to be 99% certain that he is within 10 percentage points of the population percentage. How large a sample does Belfry need?

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