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4 marksAddition Rule for Probability

CSEC Additional Mathematics · 2015 · Paper 2 · Question 7(a)(ii)

A motorist passes three traffic lights. The probability of stopping at the first is 0.2, at the second is 0.5, and at the third is 0.8.

Find the probability that the motorist has to stop at AT LEAST TWO traffic lights.

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Other parts of this question

  1. 7(a)(i)Find the probability that the motorist has to stop at ONLY ONE traffic light.[4 marks]
  2. 7(b)Use the data in the following table to estimate the mean of x.[4 marks]
  3. 7(c)(i)Draw a probability tree diagram to illustrate the information, and show the probability on ALL of the branches.[4 marks]
  4. 7(c)(ii)Determine the probability that it will rain on the Wednesday of that week.[4 marks]

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