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.
8 exam-style questions on WJEC A Level Maths 2.2.6 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.