Question: An experimental serum was injected into 500 guinea pigs. Initially, 150 of the guinea pigs had circular cells, 250 had elliptical cells, & 100 had irregularly shaped cells. After a serum was injected, none of the guinea pigs with circular cells were affected, 50 with elliptical cells were affected, & all of those with irregular cells were affected. Determine the empirical probability that a guineas pig with
[A] Elliptical cells,
[B] Circular cells,
[C] Irregular cells will be affected by injection of the serum.