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The software developers of a billing system of ACME Telecom Company would accept at most an error rate of 4% that a sample of invoices

The software developers of a billing system of ACME Telecom Company would accept at most an error rate of 4% that a sample of invoices would contain some variations that may be present in a large population of total invoices. With a certainty factor of 1.95 how many invoices would they need to examine?

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