The mean anual income of households in birr 15000. Assume that the

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The mean anual income of households in birr 15000. Assume that the incimes of households have a distribution that is skewed to the right with a mean of Birr 15000 and a standard deviation of Birr 6000. Find the probability that the mean for a random sample of 400 households will be a) within birr 600 of the population mean

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