Answer: Law of large number
Step-by-step explanation:
Law of large number is the law states that a selected large sample of people in an average displays close relation with average of complete population. This mechanism is used in probability and statistics field that shows better estimate through large population samples.
According to the question, Gabe's decision was influenced through law of large numbers where he saw large sample of people buying newly launched mobile phone.Thus, he is making his interpretation that phone must be an excellent product through estimating large sample of people purchasing it.