A survey revealed the amount of pocket money held by each student in a sample of students. The amounts in dollars are: 5.50, 10.20, 3.15, 6.08, 4.85, 4.80, 4.70, 8.52, 7.90, 6.10, 3.50, 5.40, 7.10, 9.60, 6.24, and 4.28. Assume sigma=2.00. Find the 99% confidence interval for the population mean.