An owner of a large car lot believes that fuel prices are going to rise significantly and wonders how this rise might affect demand for high performance vehicles. Specifically, the owner is investigating a link between how fast a car can go from 0 to 60 miles per hour (measured in seconds) and the car's gas efficiency as measured in miles traveled per gallon used (mpg). If fast cars, which are normally high in demand, are associated with higher mpg, then there will be much less demand if gas prices rise as predicted. The owner gathers data on 10 vehicles; the data is reproduced in the table below. Calculate the correlation coefficient r using a TI-83, TI-83 plus, or TI-84 graphing calculator (round your answer to two decimal places). mpg 20 20 21 20 20 21 21 20 19 19 0 to 60 (s) 9.2 6.1 6.6 6.8 7.5 7.7 7.8 7.8 8 7.9