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In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean

In a survey, 11 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $40 and standard deviation of $6. Construct a confidence interval at a 80% confidence level. Give your answers to one decimal place.

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