3482数学中等derivationmedium

Expected Questions for a Balanced Three-State Triage

题目

A binary tree first asks whether the state is in {S1, S2}. If yes, one more question separates S1 from S2. If no, the answer is S3. If prior probabilities are [0.5, 0.25, 0.25], what is the expected number of questions?

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