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4. We want to estimate the average monthly billing for electricity in the month of July in the family's houses in the city of Chetumal.

4. We want to estimate the average monthly billing for electricity in the month of July in the family's houses in the city of Chetumal. It is known that the standard deviation is $ 600. We want to estimate the average billing for July with an approximation of +/-$ 100 of the real average, with 95% confidence. What sample size do you need

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