The lifetimes of batteries from two suppliers are summarised below.
Supplier
Mean lifetime (hours)
Standard deviation (hours)
P
42.6
5.8
Q
40.9
2.7
Compare the battery lifetimes from the two suppliers.
[2]
Markscheme
2.5.3 Data presentation and interpretation Questions
8 exam-style questions on CCEA A Level Maths 2.5.3 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.