Asked about Probability, and reading an experiment honestly
Why report p95 latency rather than the mean?
An answer that works
Latency is long-tailed, so the mean is pulled around by a few slow requests and hides them at the same time. The high percentile is what users actually experience when things go wrong.
Reading an answer is not being able to give one. The section that teaches this is Probability, and reading an experiment honestly, 6 hours of Probability & statistics.
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