2. A video store keeps track of the number of DVDs that customers rent at one time. It finds that 47 customers rented one video, 65 rented two, 59 rented three, 25 rented four, 12 rented five, 4 rented six and 1 rented nine. What is the average number of rentals per customer? (Bonus: What value that might impact the average is missing because it is unavailable?)