We can answer the question partially based on the information provided, but crucial details are missing:
Unknown information: We don't know what you want to find out about the 900 people with negative tests.
Here's what we can determine:
Total population: 1000 people were tested.
Positive cases: 80 individuals have lung cancer.
Negative cases: 1000 - 80 = 920 people tested negative.
However, the information about 900 negative cases is incomplete.
Here are possible interpretations and what they reveal:
Scenario 1: If the question refers to all 900 negative cases:
We know 920 people tested negative (previously mentioned).
There's a discrepancy of 20 people (920 - 900).
Without clarification, it's impossible to determine anything specific about these 900 individuals.
Scenario 2: If the question focuses on a specific group within the 900 negative cases:
We still lack crucial details about this group.
Knowing additional information like sample size or selection criteria is necessary.
Therefore, to answer the question definitively, we need more context about the 900 negative cases.
Here's a rephrased response that acknowledges the limitations:
Based on the information provided, it's impossible to determine anything specific about the 900 people with negative tests.
We know 80 individuals have lung cancer and 920 tested negative.
However, the information about the specific group within the 900 negative cases is missing.
If you can provide additional details about the 900 negative cases (sample size, selection criteria), a more precise answer might be possible.