3. The petrol station A - J, which are situated in areas of similar traffic density are ranked firstly according to quality of service, secondly according to the size of the forecourt and thirdly according to the price of the petrol sold. Rank 1 indicates best service, largest forecourt and lowest price. The results including the average weekly petrol sales are given below: Station Quality of Forecourt Petrol Sales (000 of service size price gallons) A 3 8 47 B 4.5 20 10 23 2 36 36 InTMGO 5 31 OHOFUNOOf 9 33 6 10 28 4.5 42 24 (a) Carry out calculations to decide whether price of petrol or quality of service is likely to be more important factor in determining the volume of petrol sales, or whether neither appears to important. (b) Is there any evidence to suggest that those stations with large forecourts give better service? 4. The total monthly cost and the monthly output of electronic component in a factory for ten months are tabulated below: Output 21 3 5 24 19 15 11 9 14 9 ('000s ) Total 530 31 71 54 52 40 33 45 38 cost ( $'000s )