What is the probability that the sample has restaurants, Basic Statistics

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What is the probability that the sample has restaurants

According to the National Restaurant Association, 20% of fine-dining restaurants have instituted policies restricting the use of cell phones. From a sample of 100 fine-dining restaurants,

a. what is the probability that the sample has between 15% and 25% of restaurants that have established such policies?
b. the probability is 90% that the sample percentage will be contained within what symmetrical limits of the population percentage?

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