Need Quick Help on these !these two are relevant to each other, butExample ? The household incomes in a metropolitan area have mean $36,400 and standa

Need Quick Help on these !these two are relevant to each other, butExample ? The household incomes in a metropolitan area have mean $36,400 and standard deviation $11,700. If a random sample of 400 households is drawn and its sample mean calculated, with what probability will the absolute sampling error exceed $500?Example ? How large a sample is needed above to have P(|X? ? ?| > 500) < 0.1?