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Level 2: 2 × 1.5 = 3 minutes.
Level 3: 3 × 1.5 = 4.5 minutes.
Total: 2 + 3 + 4.5 = 9.5 minutes.
#### 9.5
A science educator measures bacterial growth. The population doubles every 3 hours. If it starts with 500 bacteria, how many are present after 12 hours?
Number of doublings: 12 / 3 = 4.
Final count: 500 × 2⁴ = 500 × 16 = 8,000.
A software developer's app crashes 2 times per day on average. What is the probability it crashes exactly once in a 3-day week?
Use Poisson distribution: λ = 2 × 3 = 6.
P(X=1) = (e⁻⁶ × 6¹) / 1! ≈ (0.002478 × 6) / 1 ≈ 0.01487.