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In a file of a commercial establishment there are 12,600 sales invoices corresponding to the sales of the last year. It is desired to estimate

In a file of a commercial establishment there are 12,600 sales invoices corresponding to the sales of the last year. It is desired to estimate a mean of sales with a confidence of 98% and with a sampling error that is not greater than 1000. The standard deviation in the previous year after had a value of 12900. What number of sales invoices should be randomly selected from this file?

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