19. In testing a lethal concentration of a chemical found in polluted water, researchers have determined that a certain concentration will kill 20% of the fish that are subjected to it for 24 hours. If 10 fish are placed in the tank for 24 hours with this concentration of chemical, find the following probability that (a) Exactly 4 will survive? (b) At least 7 will survive? (c) At the most 6 will survive?

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