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An insurance company wants to estimate the average premium that is charged for California female drivers aged 16 - 18. A previous study found the

An insurance company wants to estimate the average premium that is charged for California female drivers aged 16 - 18. A previous study found the population standard deviation for premiums charged to be $20. If the company wants to be 95% confident in their estimate and hope to be within $5 of the true population mean premium, how many California drivers should the company survey?

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