In ergonomic design, which percentile range is commonly used for anthropometric data to ensure usability for a wide range of users?

In ergonomic design, which percentile range is commonly used for anthropometric data to ensure usability for a wide range of users?

• A. 50th percentile
• B. 95th and 5th percentile
• C. 99th percentile
• D. 20th percentile

Answer: (B)

To fit a wide range of users, designers rely on the extremes of typical body sizes. Using the span from the 5th to the 95th percentile creates a design envelope that accommodates about 90% of people. The 5th percentile covers smaller users, and the 95th covers larger users, ensuring both reach and clearance are usable for most. Relying on the median alone would leave many users uncomfortable or unable to use the product, while focusing on extremely high percentiles would neglect the majority in between. So the commonly used range is the 5th to the 95th percentile.

To fit a wide range of users, designers rely on the extremes of typical body sizes. Using the span from the 5th to the 95th percentile creates a design envelope that accommodates about 90% of people. The 5th percentile covers smaller users, and the 95th covers larger users, ensuring both reach and clearance are usable for most. Relying on the median alone would leave many users uncomfortable or unable to use the product, while focusing on extremely high percentiles would neglect the majority in between. So the commonly used range is the 5th to the 95th percentile.