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Weights of erasers produced by a certain factory are known to follow the uniform distribution between 31.5 g and 32.3 g. (a) (10 points) Erasers

Weights of erasers produced by a certain factory are known to follow the uniform distribution between 31.5 g and 32.3 g. (a) (10 points) Erasers produced by this factory are sold in packs of 45. A retailer randomly bought 200 packs. Find the probability that, for at least 15 packs, the average weight of the erasers in the pack is at least 31.95 g

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