A community health service is planning a contraception programme for 900 users. An audit recorded the following numbers during one year of typical use.
| Method | Users in audit | Pregnancies in audit |
|---|---|---|
| Combined pill | 400 | 32 |
| Hormone-releasing intrauterine system | 500 | 5 |
The service proposes allocating 500 users to the combined pill and 400 users to the hormone-releasing intrauterine system. It will accept the proposal only if the expected number of pregnancies is no more than 45 during one year of typical use.
Calculate the expected total number of pregnancies for the proposed allocation and state whether the allocation meets the service's target.
90 exam-style questions on Edexcel GCSE Biology 7.2 Reproductive hormones, covering 7.2.1 Stages of the menstrual cycle, 7.2.2 Hormonal control of the menstrual cycle, 7.2.3 Hormonal contraception, 7.2.4 Evaluating contraception methods, and 7.2.5 Hormones in Assisted Reproductive Technology. Each one has a worked solution and a mark scheme showing where the marks go.