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A nancial regulator is interested in determining the average disposable income of its customers. From a pilot study they estimate the standard deviation of average

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A nancial regulator is interested in determining the average disposable income of its customers. From a pilot study they estimate the standard deviation of average disposable income to be $146 a month. How many customers should they sample if they want to obtain an accuracy of $12 per annum at the 99% level? Please show your working

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