A company has three divisions, and auditors are attempting to estimate the total amounts of the company's

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A company has three divisions, and auditors are attempting to estimate the total amounts of the company's accounts receivable. Random samples of these accounts were taken for each of the three divisions, yielding the results shown in the table.

(a) Using an unbiased estimation procedure, find a point estimate of the total value of all accounts receivable for this company.

(b) Find a 95% confidence interval for the total value of all accounts receivable for this company.

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