Final answer:
In a situation where you need to save two people, it would be advisable to save the person with the lower chances of survival first. In this scenario, you should save your niece first as she is a poor swimmer and might not survive much longer. By doing so, you increase the overall chances of both girls surviving.
Step-by-step explanation:
When faced with a situation where you need to save two people, it can be incredibly difficult to make a decision. In this scenario, both your daughter and your niece are in danger. Your niece is a poor swimmer and might not survive much longer, while your daughter is a stronger swimmer but has only a 50% chance of holding on until you return. In this case, it would be advisable to save your niece first.
The reason for this is that your niece's chances of survival are lower, and every second counts. By saving her first, you increase the overall chances of both girls surviving. If you were to save your daughter first and then come back for your niece, it might be too late to save her.
It's important to prioritize based on the immediate risk and likelihood of survival. Saving your niece first gives her a better chance of survival, and then you can quickly go back for your daughter.