A particular concentration of a chemical found in polluted water has been found to be lethal to 20% of the fish that are exposed to the concentration for 24 hours. Twenty fish are placed in a tank containing this concentration of chemical in water. a Find the probability that exactly 14 survive. b Find the probability that at least 10 survive. e Find the probability that at most 16 survive. d Find the mean and variance of the number that survive.

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