plan ab cd a class investigated how much time children at their school spent on twitter. a pupil...
TRANSCRIPT
Plan
A B
C D
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
Discuss Process
The pupil is being asked about their twitter usage, which is part of the data collection for the investigation
0.9, 1.5, 1.7, 5.0, 7.0
A B
C D
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, 0.9 1.7, 5.0, 7.0, 1.5, 0.9
The crime rate has reduced over the last five centuries.
William
A B
C D
Which name was the most popular for baby boys in 2011?
Jack
Harry Charlie
The most popular name for new-born boys in 2011 was Harry.
28
A B
C D
Which is the best estimate of the median age of all the people in the world?
35
42 51
The median age is about 28. This may seem low, but in less economically developed countries there is a much lower life expectancy.
0.13
A B
C D
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
0.38 0.64
3(0.8)2 × 0.2 = 0.384
Which box and whisker diagram shows the same data as the histogram?
A B
C
A B
C D
10
A B
C D
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
40 50
2 × 10 × 0.5 = 10
Average heights of school pupils by age and gender
A B
C D
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
Avera
ge
Sco
re (
0-6
0)
11
A B
C D
The UK is the nth most densely populated country in the world. What is n?
31
51 101
The UK is the 51st most densely populated country in the world.