Edexcel S1 2009 January — Question 2

Exam BoardEdexcel
ModuleS1 (Statistics 1)
Year2009
SessionJanuary
TopicConditional Probability
TypeGiven conditional, find joint or marginal

2. A group of office workers were questioned for a health magazine and \(\frac { 2 } { 5 }\) were found to take regular exercise. When questioned about their eating habits \(\frac { 2 } { 3 }\) said they always eat breakfast and, of those who always eat breakfast \(\frac { 9 } { 25 }\) also took regular exercise. Find the probability that a randomly selected member of the group
  1. always eats breakfast and takes regular exercise,
  2. does not always eat breakfast and does not take regular exercise.
  3. Determine, giving your reason, whether or not always eating breakfast and taking regular exercise are statistically independent.