=+5.68 ● Athletes competing in a triathlon participated in a study described in the paper “Myoglobinemia and Endurance Exercise” (American Journal of Sports Medicine

[1984]: 113–118). The following data on finishing time x

(in hours) and myoglobin level y (in nanograms per milliliter) were read from a scatterplot in the paper:

x 4.90 4.70 5.35 5.22 5.20 y 1590 1550 1360 895 865 x 5.40 5.70 6.00 6.20 6.10 y 905 895 910 700 675 x 5.60 5.35 5.75 5.35 6.00 y 540 540 440 380 300