1. A local mini market sells one-kilogram packs of sugar. There are complaints that the weight of the sugar sold is less than a kilogram. A consumer association selects a sample of 50 packs. The sample shows that the average weight is 0.990 kg. The consumer association assumes the population standard deviation to be 0.05 kg. Using the 0.05 level of significance, test whether the sugar packs sold are underweight.

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