How Many Evaluators Identify 75%-80% of Usability Problems?

Explanation:

The question refers to Nielsen's findings on the identification of usability problems. Unfortunately, the provided reference information does not directly pertain to Nielsen's study on evaluators identifying usability problems, so we cannot provide a specific answer with the information provided. However, it is important to note that Nielsen's study involves a group of evaluators who review a product's usability as a team, and their task is to identify and document usability problems. The average number of evaluators who identify a specific percentage of usability problems will vary depending on the team's composition and the nature of the product being evaluated.