A survey of several 8 to 11 year olds recorded the following amounts spent on a trip to the mall: $19.36, $29.95, $7.82, $8.36, $21.07, $14.06, $22.22 Construct the 80% confidence interval for the average amount spent by 8 to 11 year olds on a trip to the mall. Assume the population is approximately norm Co Step 1 of 4: Calculate the sample mean for the given sample data. Round your answer to two decimal places.

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