A department of transportation's study on driving speed and miles per gallon for midsize automobiles resulted in the following data.
Speed (Miles per Hour),30,50,40,55,30,25,60,25,50,55
Miles per Gallon 27,26,25,23,31,31,22,34,25,26
Compute the sample correlation coefficient using the =CORREL(x,y) function in excel. (Round your answer to two decimal places.)