What is the survival rate after 5 days?

• A. 81%
• B. 36.7%
• C. 19%
• D. 7.4%

Answer: (D)

Survival rate after a fixed time is the portion of the original group that remains alive at that time, reflecting how hazards accumulate over days in a high‑risk environment. Five days into a collapse scenario, attrition tends to be steep, so a very low survival figure is expected.

Think of survival as compounding each day: the overall five-day survival is the daily survival rate raised to the fifth power. If the five-day survival is about 7.4%, that means the daily survival rate is roughly the fifth root of 0.074, which is about 0.59 (roughly 59%). In other words, about 59% of the remaining individuals survive each day, and after five consecutive days that compounds to around 7–8% overall. This aligns with the option showing 7.4%.

The larger percentages would require much higher daily survival rates or less severe daily attrition, which is less consistent with a scenario where hazards persist across multiple days. Hence the 7.4% value best matches the expected trend of rapid, cumulative loss over five days.