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(a) A slurry has a particle size distribution that obeys the log normal distribution: 7% by weight of the particles have a diameter greater than

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(a) A slurry has a particle size distribution that obeys the log normal distribution: 7% by weight of the particles have a diameter greater than 120m and 6% by weight less than 50m. After separation in a sedimentation centrifuge, 19% of the slurry is recovered. What is the size of recovered particles? [20 marks]

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