OCR MEI S1 — Question 5

Exam BoardOCR MEI
ModuleS1 (Statistics 1)
TopicConditional Probability
TypeVenn diagram with two events

5 In a recent survey, a large number of working people were asked whether they worked full-time or part-time, with part-time being defined as less than 25 hours per week. One of the respondents is selected at random.
  • \(W\) is the event that this person works part-time.
  • \(F\) is the event that this person is female.
You are given that \(\mathrm { P } ( W ) = 0.14 , \mathrm { P } ( F ) = 0.41\) and \(\mathrm { P } ( W \cap F ) = 0.11\).
  1. Draw a Venn diagram showing the events \(W\) and \(F\), and fill in the probability corresponding to each of the four regions of your diagram.
  2. Determine whether the events \(W\) and \(F\) are independent.
  3. Find \(\mathrm { P } ( W \mid F )\) and explain what this probability represents.