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Hi, please help me to solve it. 6. A particular concentration of a chemical found in polluted water has been found to be lethal to

Hi, please help me to solve it.

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6. A particular concentration of a chemical found in polluted water has been found to be lethal to 20% of the sh that are exposed to the concentration for 24 hours. Twenty sh 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. c) Find the probability that at most 16 survive. d) Find the mean and variance of the number that survive

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