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All 4 Flashcards — Percentiles
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Question
What is a percentile?
Answer
The value below which a given percentage of a population falls. The 5th percentile of reach means 5% of people reach less far than that.
Question
Reach or clearance — which percentile?
Answer
Reach is set from the SMALLEST user (5th percentile); clearance is set from the LARGEST user (95th percentile).
Question
When is the 50th percentile the right choice, and when is it wrong?
Answer
Right for a fixed height that everyone shares, such as a kitchen counter or a non-adjustable handle. Wrong for a reach or a clearance, where it fails half the population.
Question
What does the 5th-to-95th percentile range cover, and why stop there?
Answer
90% of the user population. Covering the last 5% at each extreme usually costs far more in mechanism and tooling than it gains in users, so it is excluded as a stated decision.
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Topic 1.1 hub
Ergonomics
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