Question 3 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. 3-' a. Find the probability that exactly 14 survive. b. Find the probability that at least 10 survive.. c. Find the probability that at most 6 lethal. d. Find the mean and variance of the number that survive. (+210 M-20

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