Two hundred employee travel expense reimbursement vouchers were filed last year in the finance department at Ramjac Corporation. Of these, 20 contained errors. A corporate auditor audits a sample of five vouchers. Let X be the number of incorrect vouchers in the sample. (a) Is the binomial approximation justified? Yes No (b) Find the probability that the sample contains no erroneous vouchers. (Do not round your intermediate answers. Round your answer to 4 decimal places.) Answer is complete but not entirely correct. (c) Find the probability that the sample contains at least two erroneous vouchers. (Do not round your intermediate answers. Round your answer to 4 decimal places.)