During one month, MegaInvoice Company (MIC) processed 30,000 invoices for Alpha Corp, 19,000 for Beta Corp, and

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During one month, MegaInvoice Company (MIC) processed 30,000 invoices for Alpha Corp, 19,000 for Beta Corp, and 15,000 for Gamma Corp. Of these, 300 of the Alpha, 323 of the Beta, and 285 of the Gamma invoices had to be reprocessed for errors. What is the overall defect rate and the sigma level for all of the combined batches? For each individual batch?

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