Disney’s Hannah Montana: The Movie opened on Easter weekend in April 2009. Over the three-day weekend, the movie became the number-one box office attraction (The Wall Street Journal, April 13, 2009). The ticket sales revenue in dollars for a sample of 25 theaters is as follows.

20,200 10,150 13,000 11,320 9700 8350 7300 14,000 9940 11,200 10,750 6240 12,700 7430 13,500 13,900 4200 6750 6700 9330 13,185 9200 21,400 11,380 10,800

a. What is the 95% confidence interval estimate for the mean ticket sales revenue per theater? Interpret this result.

b. Using the movie ticket price of $7.16 per ticket, what is the estimate of the mean number of customers per theater?

c. The movie was shown in 3118 theaters. Estimate the total number of customers who saw Hannah Montana: The Movie and the total box office ticket sales for the threeday weekend.