The annual mileage of each of 400 cars is recorded. For these cars, x x\,x is the annual mileage in thousands of miles, and
∑x=4800\sum x = 4800∑x=4800 and ∑x2=61 200\sum x^2 = 61\,200∑x2=61200
Calculate the mean annual mileage of these cars.
Calculate the standard deviation of the annual mileage of these cars.
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.