Question: The marketing department of a manufacturing company wanted to find out how many blank video cassettes are purchased by the average American each year. The data for a random sample of .Americans are as follows: 7, 0, 6, 3, 10, 0, 4, 9, 6, 3, 12, 0, 5, 1, 8, 6. Find the 99% confidence interval for the mean of the population.