Final answer:
It is not possible to determine whose score was the best compared to his or her own class based on the given information.
Step-by-step explanation:
To find whose score was the best compared to his or her own class, you would need more information about the scores of the students in the class. The information provided in your question is about gambling and the number of days compulsive gamblers go to casinos per week. It does not provide any information about scores in a class. Therefore, it is not possible to determine whose score was the best compared to his or her own class based on the given information.