Final answer:
The belief that most people are above average reflects the self-serving bias, where individuals attribute their successes to themselves and failures to external factors.
Step-by-step explanation:
The finding that most people believe they are above average is an illustration of the self-serving bias. This bias refers to the tendency for individuals to view themselves in a particularly positive light and to take credit for their successes while typically attributing failures to external factors. The self-serving bias is different from the fundamental attribution error, which is the tendency to attribute others' actions to their character rather than to situational factors. It also differs from the confirmation bias, which is the tendency to seek out and interpret information in a way that confirms one's preexisting beliefs and hypotheses.