A particular concentration of a chemical found in polluted water has been found to be lethal...

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A particular concentration of a chemical found in polluted water has been found to be lethal to 23% of the fish that are exposed to the concentration for 24 hours. Twenty-six fish are placed in a tank containing this concentration of chemical in water. (a) Use R to calculate the probability that exactly 18 survive. (Round your answer to three decimal places.) (b) Use R to calculate the probability that at least 13 survive. (Round your answer to three decimal places.) Probabilities should be between 0 and 1. (c) Use R to calculate the probability that at most 20 Jurvive. (Round your answer to three decimal places.) (d) Use R to find the mean and variance of the number that survive. (Round your variance to two decimal places.) mean variance A particular concentration of a chemical found in polluted water has been found to be lethal to 23% of the fish that are exposed to the concentration for 24 hours. Twenty-six fish are placed in a tank containing this concentration of chemical in water. (a) Use R to calculate the probability that exactly 18 survive. (Round your answer to three decimal places.) (b) Use R to calculate the probability that at least 13 survive. (Round your answer to three decimal places.) Probabilities should be between 0 and 1. (c) Use R to calculate the probability that at most 20 Jurvive. (Round your answer to three decimal places.) (d) Use R to find the mean and variance of the number that survive. (Round your variance to two decimal places.) mean variance

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