In a study of possible correlation between the height, x in cm and the weight, y in kg, of chimpanzees, a sample of 40 animals produces a correlation coefficient of = 0.813, and a regression line with equation = 0.34 + 19.5. What is the expected weight of a 80 cm tall chimpanzee?

a) 177.9

b)57.1

c) 24.0

d) 46.7