The figure plots the average brain weight in grams versus average body weight in kilograms for many species of mammals. There are many small mammals whose points at the lower left overlap. 4500- elephant 4000- 3500 - 3000 - 2500 - Brain weight (grams) 2000 - 1500- o dolphin . human 1000 - 500 - . hippo $8 8 8 2400 2600 2800 1800 0OZZ Body weight (kilograms) Moore/Notz, Statistics: Concepts and Controversies, 10e, O 2020 W. H. Freeman and Company The correlation between body weight and brain weight is r = 0.86. What percentage of the variation in brain weight for mammals is explained by the straight-line relationship between brain weight and body weight? (Use decimal notation. Give your answer as an exact number.)