問題文
A retailer measures the latency of its product assistant and reports an average of 780 milliseconds, which is within the 1.5-second target. Support still receives complaints that the assistant is slow. What is the most likely reason the metric and the complaints disagree?
選択肢
- Users are comparing the assistant to competitors rather than to the stated target.
- Latency measurements taken on the server always understate what users experience by a constant factor.
- The average hides a tail: a meaningful share of requests may take far longer, and those are the requests users complain about.
- The latency target of 1.5 seconds is too generous and should be lowered to 500 milliseconds.