The numbers of visitors, in thousands, to an attraction in four months are shown below.
| Month | January | April | July | October |
|---|---|---|---|---|
| Visitors | 42 | 58 | 96 | 61 |
Joan estimates the annual number of visitors by multiplying the July figure by 12.
Calculate Joan's estimate.
Critique her method.
Suggest one improvement.
36 exam-style questions on CCEA A Level Maths 2.4 Statistical sampling, covering 2.4.1 Statistical sampling, 2.4.2 Statistical sampling, 2.4.3 Statistical sampling, and 2.4.4 Statistical sampling. Each one has a worked solution and a mark scheme showing where the marks go.