Designers generally consider individuals below the 5th percentile and above the 95th percentile to be:

Individuals below the 5th percentile and above the 95th percentile are typically seen as extremes in size and, therefore, do not represent the average population. In design contexts, products are primarily aimed at the average user, which is generally located within the 5th to 95th percentiles. Those who fall outside this range are considered too short or too tall for standard products, meaning their ergonomic needs may not be adequately met by designs intended for average users. This perspective is crucial for designers who aim to create products that are inclusive and functional for the majority rather than the few.

In contrast, those described in the other choices may imply various misconceptions; for instance, viewing these individuals as ideal representations would overlook their extremes and ignore the need for broader considerations in product usability. Similarly, labeling them as average-sized negates the fact that they lie outside the norm, and calling them experts in ergonomic needs misses the reality that their unique proportions may require specialized or customized solutions rather than typical designs.