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3 marksBasic Laws of Probability

CSEC Additional Mathematics · 2013 · Paper 2 · Question 7(a)(ii)

At a service station, 40% of petrol buyers are females. Of females, 30% pay with cash. Of males, 65% pay with cash.

What is the probability that a customer pays for petrol with cash?

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Other parts of this question

  1. 7(a)(i)Copy and complete the following tree diagram, by putting in all the missing probabilities, to show this information.[2 marks]
  2. 7(a)(iii)Determine which is the more likely event: Event T or Event V.[4 marks]
  3. 7(b)(i)State ONE advantage of using a stem and leaf diagram versus a box and whiskers plot to display the data.[1 mark]
  4. 7(b)(ii)Construct a stem and leaf diagram to show the data.[3 marks]
  5. 7(b)(iii)Determine the median mark.[2 marks]
  6. 7(b)(iv)Calculate the semi inter-quartile range of the marks.[3 marks]
  7. 7(b)(v)Determine the probability that both scored less than 50 on the exam.[2 marks]

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