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4 marksSolving Probability Problems using Diagrams

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

Research shows that if it rains on any day, the probability it rains the next day is 25%. If it does not rain, the probability it rains the next day is 12%. It rains on Monday.

Determine the probability that it will rain on the Wednesday of that week.

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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(a)(ii)Find the probability that the motorist has to stop at AT LEAST TWO traffic lights.[4 marks]
  3. 7(b)Use the data in the following table to estimate the mean of x.[4 marks]
  4. 7(c)(i)Draw a probability tree diagram to illustrate the information, and show the probability on ALL of the branches.[4 marks]

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