A town council commissioned a random sample of 85 households to estimate the number of four-wheel vehicles per household in the town. The results are shown in the following frequency table. x 0 1 2 3 4 5 f 1 16 28 22 12 6 Construct a 99% confidence interval for the average number of four-wheel vehicles per household in the town.

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A town council commissioned a random sample of 85 households to estimate the number of four-wheel vehicles per household in the town. The results are shown in the following frequency table.

x 0 1 2 3 4 5
f 1 16 28 22 12 6

Construct a 99% confidence interval for the average number of four-wheel vehicles per household in the town.

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