A person's blood group is determined by whether or not it contains any of 3 substances AAA, B B\,B and CCC.
A doctor surveyed 300 patients' blood and produced the table below.
| Blood contains | No. of Patients |
|---|---|
| only CCC | 100 |
| A A\,A and C C\,C but not BBB | 100 |
| only AAA | 30 |
| B B\,B and C C\,C but not AAA | 25 |
| only BBB | 12 |
| AAA, B B\,B and CCC | 10 |
| A A\,A and B B\,B but not CCC | 3 |
Draw a Venn diagram to represent this information.
Find the probability that a randomly chosen patient's blood contains substance CCC.
Harry is one of the patients. Given that his blood contains substance AAA, find the probability that his blood contains all 3 substances.
Patients whose blood contains none of these substances are called universal blood donors. Find the probability that a randomly chosen patient is a universal blood donor.
Practise Edexcel A Level Old Maths Probability with exam-style questions for A Level Old Maths. 11 questions, matched to the Edexcel A Level Old Maths (9371) specification and written in Unit exams C1, C2, C3 and C4 plus two applied units (e.g. S1 and M1) style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.