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30. A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded

30. A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded for each household in the sample. The mean usage was found to be 375 kWh and the standard deviation of the usage was 81 kWh. Provide an expression for calculating a 99% confidence interval for the mean usage in the population

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