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An organisation is interested in determining the average disposable income of its customers. From a research they estimate the standard deviation of average disposable income

An organisation is interested in determining the average disposable income of its customers. From a research they estimate the standard deviation of average disposable income to be $228 a month. How many customers should they sample if they want to obtain an accuracy of $8 per annum at the 99% level? Please show your working as if you did it by hand in a notebook.

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