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19. The mass of packets of sugar are normally distributed. In a large consignment of t packets of sugar, it is found hat 99.76 %

19. The mass of packets of sugar are normally distributed. In a large consignment of t packets of sugar, it is found hat 99.76 \% of them have a mass greater than 286g and probability of each pack is less than 312g is 0.9918. Estimate the mean and the variance of this distribution

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