Welcome to your interview.
The question is on your right: Use Bayes for Anomaly Detection. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain the concept of conditional probability and how you would apply Bayes' Theorem to detect anomalous transaction patterns.