Use the margin of error E = $10, confidence level of 99%, and ó = $40 to find the minimum sample size needed to estimate an unknown population mean, .ì

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  1. Formula:
    n = [(z-value * sd)/E]^2
    ...where n = sample size, z-value will be 2.58 for 99% interval, sd = 40, E = 10, ^2 means squared, and * means to multiply.

    Plug the values into the formula and finish the calculation. Round your answer to the next highest whole number.

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