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An auditor samples 100 of a firm level vouchers to ascertain what percentage of the whole set of voucher are improperly documented. what is the approximate probability that more than 30% of the sampled vouchers are improperly documented if, in fact, only 20%of all vouchers are improperly documented. If you were an auditor and observed more than 30% with improper documentation, what would you conclude about the firms claim that only 20% suffered from improper documentation and why?

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