Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 72 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 15.6 and a standard deviation of 2.8. What is the 99% confidence interval for the number of chocolate chips per cookie for Big Chip cookies? Round your answer to 2 decimal places. <με

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