1. Plan AB CD A class investigated how much time children at their school spent on Twitter. A pupil said “I never use Twitter”. Which part of the Problem Solving Cycle is the pupil talking about? Collect DiscussProcess The pupil is being asked about their twitter usage, which is part of the data collection for the investigation

2. 0.9, 1.5, 1.7, 5.0, 7.0 AB CD The annual murder rates in England, per 100,000 of the population, for the last five centuries were: 0.9, 7.0, 1.7, 5.0, 1.5 – but not in that order. The correct order, earliest century first, is: 5.0, 1.7, 0.9, 1.5, 7.0 7.0, 5.0, 1.7, 1.5, 0.91.7, 5.0, 7.0, 1.5, 0.9 The crime rate has reduced over the last five centuries.

3. William AB CD Which name was the most popular for baby boys in 2011? Jack HarryCharlie The most popular name for new-born boys in 2011 was Harry.

4. 28 AB CD Which is the best estimate of the median age of all the people in the world? 35 4251 The median age is about 28. This may seem low, but in less economically developed countries there is a much lower life expectancy.

5. 0.13 AB CD 80% of children like cake. 3 children are chosen at random. What is the probability that exactly 2 of these children like cake (2s.f.)? 0.26 0.380.64 3(0.8) 2 × 0.2 = 0.384

6. Which box and whisker diagram shows the same data as the histogram? AB C AB CD

7. 10 AB CD A report claims that drinking tea increases your risk of a certain type of disease by 50%. This disease affects 2 in 1,000 people who do not drink tea. If 10,000 people all started drinking tea, how many extra cases of this disease would you expect? 20 4050 2 × 10 × 0.5 = 10

8. Average heights of school pupils by age and gender AB CD Average monthly temperature in the UK Average WinAtSchool quiz scores by age and gender Which one of the variables listed below is the graph most likely to represent? The length of phone calls to a computer helpline Under 10 10 11 12 13 14 15 16 17 18 over 18 Age girls boys Average Score (0-60)

9. 11 AB CD The UK is the n th most densely populated country in the world. What is n? 31 51101 The UK is the 51 st most densely populated country in the world.