20. In a sample of 12 pine trees, what are the chances that a majority of the pine trees in Stanislaus National Park are not infected with bark beetles? 0 0.0001 0 0.8655 0 0.9935 0 0.9991 Along the West Coast through the Rocky Mountains, bark beetles have affected tens of millions of acres of forest. While bark beetles are native to US. forests and play important ecological roles, they can cause extensive tree mortality and negative economic and social impacts. Climate change has led to an increase in these damaging effects, and the Forest Service is working to better understand bark beetle ecology and to improve forest management. A park ranger from Stanislaus National Park says 11% of it's pine trees are infected with bark beetles. In a sample of 12 pine trees, what are the chances that a majority of the pine trees in Stanislaus National Park are not infected with bark beetles? 19. Pick the equation most appropriate to deal with the problem above. a) z=x_'E {T b) p(x)- (an)p"(1p)"" C) x = ,9+ 20' _:r:_- d) 207\