Discussion
Why does an agent with noisy sensors need a belief state?
Answer: B
With noisy or ambiguous percepts the agent cannot know its state, so it maintains a probability distribution over the possibilities and updates it as evidence arrives. Acting on the most likely state alone discards information that matters when the alternatives have very different consequences. Storage, actuator behaviour and rate of change are separate concerns. Representing what is not known, rather than guessing and proceeding, is what distinguishes a probabilistic agent from a deterministic one.
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