4.9 The classified advertisement columns of a local paper contain details of twelve used cars of a particular make and model. The prices of these cars (in £000) and the numbers of miles they have travelled (in 000) are:

Price 6.8 6.2 5.7 4.7 6.0 5.9 7.0 4.5 5.0 3.0 3.8 3.5 Mileage 9 13 11 33 14 11 3 19 22 35 40 44

(a) Present these figures in the form of a scatter diagram.

(b) Find the least squares line of best fit and plot it on your scatter diagram.

(c) Predict the price of a car of this type that has travelled 25 000 miles.