Determining potential costs for each facility

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A group of investors wants to develop a chain of fast food cafés. In determining potential costs for each facility, they must consider, among other costs, the average monthly cost of electricity. They want to be 90% confident of their results and want the error of interval estimate to be no more than $100. They estimate that such bills range from $600 to $2500. How large a sample should they take?

Reference no: EM1386159

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