A second-hand car dealer wants to investigate the relationship between the price of the car (in RM000) and the mileage travelled (000km). He randomly selected 10 cars from his workshop and the data collected are shown in the table below. Mileage (000km) Price 18 22 25 30 42 38 50 58 65 74 56 54 48 40 43 35 27 25 19 15 (RM000) Σχ-422, ΣΥ-362, Σχ -21106, ΣΥ- 14970, ΣΧΥ- 12877 a) Use a relevant measurement to describe the relationship between the price of the car and the mileage travelled.

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