Math Problem Statement
The efficacy of the influenza A vaccine is about 90%; that is, 90% of those receiving the influenza A vaccine will not contract the disease when exposed. Assume that each person’s response to influenza A is independent of another person’s response. How many vaccinated people must be exposed to the influenza A so that the probability of at least one person contracting the disease is at least 0.95?
Solution
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Math Problem Analysis
Mathematical Concepts
Probability
Complementary Probability
Logarithms
Exponential Decay
Formulas
P(at least one person contracts the disease) = 1 - 0.9^n
0.9^n ≤ 0.05
n ≥ ln(0.05) / ln(0.9)
Theorems
Complementary Probability Theorem
Laws of Logarithms
Suitable Grade Level
Grades 10-12
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