The eight values 2,4,4,5,5,6,7,7 2,4,4,5,5,6,7,7\,2,4,4,5,5,6,7,7 have mean 5.
a.
Calculate the variance.
[2]
b.
Hence calculate the standard deviation.
[1]
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.