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The performance of a solids mixer was assessed by calculating the variance occurring in the mass fraction of a component amongst a selection of samples withdrawn from the mixture. The quality was tested at intervals of 30 s and the data obtained are: sample variance (-) 0.025 0.006 0.015 0.018 0.019 mixing time (s) 30 60 90 120 150 If the component analysed represents 20 per cent of the mixture by mass and each of the samples removed contains appr
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