Pick the operating point when a miss costs £183m
Measurement & estimationHardProblem. Your detector's score threshold is a dial. A false positive costs an analyst about 20 minutes. A missed breach can cost £183m, as British Airways found. A colleague argues the expected-cost arithmetic obviously says to set the threshold near zero and alert on everything. Where do you set it, and why?
Before you reveal: say your answer out loud, as if you were in the real interview — get your reasoning across clearly first. There is no single correct answer: reading what the interviewer is really after and defending your own thinking is what makes an answer strong.