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The utility bills (in dollars) of 10 randomly selected homeowners in one city are listed below....

The utility bills (in dollars) of 10 randomly selected homeowners in one city are listed below. Construct a 95% confidence interval for the mean. Assume the population is normally distributed.

70, 72, 71, 70, 69, 73, 69, 68, 70, 78

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95% confidence interval for the mean =68.95 ; 73.05

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