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(b) A bioassay was carried out on shrimp in aquaria and the following data obtained after 24 hours: Number of Shrimp Surviving (of 200/aquarium)

(b) A bioassay was carried out on shrimp in aquaria and the following data obtained after 24 hours: Number of Shrimp Surviving (of 200/aquarium) 200 164 124 72 22 0 Concentration in Aquarium Water (g/l) 11.0 14.5 19.1 21.9 30.2 57.5 Estimate graphically the LC 50 and LC 80 values (6 marks)

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