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Numerical: Epidemic Growth

Mediumbiology

An infection doubles its case count every 3 days. Starting with 400 cases, how many after 9 days assuming ideal doubling?

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About This Question

Subject
biology
Chapter
biology and human welfare
Topic
numerical: epidemic growth
Difficulty
Medium
Year
2025
Tags
EpidemiologyNumerical

Solution

Correct Answer:

3200

  1. Identify Number of Intervals:
    • Total time = 9 days.
    • Doubling time = 3 days.
    • Number of doublings () = .
  2. Apply Growth Formula:
    • .
  3. Manual Check:
    • Start: 400
    • Day 3: 800
    • Day 6: 1600
    • Day 9: 3200.

This medium difficulty biology question is from the chapter biology and human welfare, covering the topic of numerical: epidemic growth. It appeared in the 2025 exam.

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