For Question 4, you first need to find how many patients went to buy contacts and how many patients went to buy glasses.
According to the graph, the number of people who bough contacts was 11 (between 10 and 12), and the number of people who bought glasses was 4.
Subtract these numbers: 11 - 4 = 7 patients, or choice (B).
For Question 2, look at the data. The lowest is 228 and the highest is 385. You would want a range that fits this best, and the range 200 to 400 would be best without cramming and without too much empty space.
