## Exam-Style Question on Frequency Tree## A mathematics exam-style question with a worked solution that can be revealed gradually |

Question id: 297. This question is similar to one that appeared on a GCSE Foundation paper. The use of a calculator is allowed.

180 pupils had some homework to do for the following day.

- 75 of these pupils are boys.
- 11 of the 180 pupils did not do their homework.
- 98 of the girls did do their homework.

(a) Use this information to complete the frequency tree.

(b) One of the girls is chosen at random. What is the probability that this girl did not do her homework?

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If you need more practice try the self-checking interactive exercises called Frequency Trees.

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