Statement: A warning in a train compartment - "To stop train, pull chain. Penalty for improper use Rs. 500." Assumptions: Some people misuse the alarm chain. On certain occasions, people may want to stop a running train.

Given data

• Notice in train: 'To stop train, pull chain. Penalty for improper use Rs. 500.'
• Assumption I: Some people misuse the chain.
• Assumption II: Sometimes passengers may need to stop a running train.

Concept/Approach
A rule specifying a function and a penalty typically presupposes legitimate use-cases and the risk of misuse.

Step-by-step reasoning
I: Without possibility or history of misuse, the warning of a penalty would be unnecessary; thus I is implicit.II: The instruction 'To stop train, pull chain' presupposes valid situations where stopping is necessary (medical emergencies, hazards). So II is implicit.

Verification/Alternative
Both a usage purpose and deterrence rationale are embedded in the notice.

Common pitfalls

• Thinking only misuse is assumed; the presence of the function itself assumes legitimate need.

Final Answer
Both I and II are implicit.