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If a disease has a 30% chance of being transmitted from an infected person to a

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Question: If a disease has a 30% chance of being transmitted from an infected person to a healthy person, what is the probability that it will not be transmitted? (2021)

Options:

  1. 0.7
  2. 0.3
  3. 0.5
  4. 0.2

Correct Answer: 0.7

Exam Year: 2021

Solution: 

The probability that the disease will not be transmitted = 1 - 0.3 = 0.7.

If a disease has a 30% chance of being transmitted from an infected person to a

Practice Questions

Q1
If a disease has a 30% chance of being transmitted from an infected person to a healthy person, what is the probability that it will not be transmitted? (2021)
  1. 0.7
  2. 0.3
  3. 0.5
  4. 0.2

Questions & Step-by-Step Solutions

If a disease has a 30% chance of being transmitted from an infected person to a healthy person, what is the probability that it will not be transmitted? (2021)
  • Step 1: Understand that the disease has a 30% chance of being transmitted. This means that if you take 100 people, about 30 of them might get the disease from an infected person.
  • Step 2: Convert the percentage chance of transmission into a decimal. 30% as a decimal is 0.3.
  • Step 3: To find the probability that the disease will NOT be transmitted, subtract the transmission probability from 1. This is because the total probability must equal 1 (or 100%).
  • Step 4: Perform the calculation: 1 - 0.3 = 0.7.
  • Step 5: The result, 0.7, means there is a 70% chance that the disease will not be transmitted.
  • Probability – Understanding the basic principles of probability, including complementary events.
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