Business
Business, 25.11.2019 23:31, ineedhelp773

The mean amount μ for all of the invoices for your company last month is not known. based on your past experience, you are willing to assume that the standard deviation of invoice amounts is about $250. if you take a random sample of 120 invoices, what is the value of the standard deviation for x? using the empirical rule, the probability is about 0.997 that x is within what amount of the population mean μ?

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