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As of the census of 2010, there were 1,258 households residing in Captain Cook, Hawaii. A...

As of the census of 2010, there were 1,258 households residing in Captain Cook, Hawaii. A recent study conducted by FrozenAire surveyed 81 of those households. The average number of refrigerators per households was 2.5, with the sample standard deviation of 1.8. Find a 90% confidence interval for the number of refrigerators per household in Captain Cook.

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