A group of office workers were questioned for a health magazine and 25\displaystyle \frac{2}{5}52 were found to take regular exercise. When questioned about their eating habits 23\displaystyle \frac{2}{3}32 said they always eat breakfast and, of those who always eat breakfast 925\displaystyle \frac{9}{25}259 also took regular exercise.
Find the probability that a randomly selected member of the group always eats breakfast and takes regular exercise.
Find the probability that a randomly selected member of the group does not always eat breakfast and does not take regular exercise.
Determine, giving your reason, whether or not always eating breakfast and taking regular exercise are statistically independent.
11 exam-style questions on Edexcel A Level Old Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.