The CO emission x x\,x g/km of each of 50 cars is recorded. For these cars,
∑x=12.5\sum x = 12.5∑x=12.5 and ∑x2=3.205\sum x^2 = 3.205∑x2=3.205
Calculate the mean and the standard deviation of these CO emissions.
105 exam-style questions on WJEC A Level Maths 2.2 Data presentation and interpretation, covering 2.2.1 Data presentation and interpretation, 2.2.2 Data presentation and interpretation, 2.2.3 Data presentation and interpretation, 2.2.4 Data presentation and interpretation, 2.2.5 Data presentation and interpretation, 2.2.6 Data presentation and interpretation, 2.2.7 Data presentation and interpretation, 2.2.8 Data presentation and interpretation, and 2.2 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.