In a botanical survey of a large woodland area, trees are classified as being either Deciduous or Evergreen.
Of the Deciduous trees, 90% are found to be carrying a specific fungal infection. Of the Evergreen trees, 25% are found to be carrying the same infection.
The proportion of trees in the woodland that are Deciduous is kkk.
Draw a tree diagram to represent this information.
In the survey, 70.5% of all trees were found to be carrying the infection.
Find the value of kkk.
One tree is selected at random from the woodland. Given that this tree is infected, find the probability that it is a Deciduous tree.
58 exam-style questions on Edexcel A Level Maths 2.2 Conditional Probability. Each one has a worked solution and a mark scheme showing where the marks go.