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If the probability of an event A is 0.4, what is the probability of the event no

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Question: If the probability of an event A is 0.4, what is the probability of the event not occurring? (2021)

Options:

  1. 0.4
  2. 0.6
  3. 0.8
  4. 0.2

Correct Answer: 0.6

Exam Year: 2021

Solution: 

Probability of not A = 1 - P(A) = 1 - 0.4 = 0.6.

If the probability of an event A is 0.4, what is the probability of the event no

Practice Questions

Q1
If the probability of an event A is 0.4, what is the probability of the event not occurring? (2021)
  1. 0.4
  2. 0.6
  3. 0.8
  4. 0.2

Questions & Step-by-Step Solutions

If the probability of an event A is 0.4, what is the probability of the event not occurring? (2021)
  • Step 1: Understand that the probability of an event A is given as 0.4.
  • Step 2: Know that the probability of an event not occurring is found by subtracting the probability of the event from 1.
  • Step 3: Use the formula: Probability of not A = 1 - P(A).
  • Step 4: Substitute the value of P(A) into the formula: Probability of not A = 1 - 0.4.
  • Step 5: Calculate the result: 1 - 0.4 = 0.6.
  • Step 6: Conclude that the probability of the event not occurring is 0.6.
  • Complementary Probability – The probability of an event not occurring is calculated as 1 minus the probability of the event occurring.
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