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1. Estimate the mean weight of 6 students randomly chosen in a university if student 1 weighs 53 kg; student 2 weighs 64 kg; student 3 weighs 49 kg: student 4 weighs 59 kg: student 5 weighs 62 kg and student 6 weighs 55kg. 2. A quality controller wants to estimate the proportion of high quality goods out of a batch of products with a 90% confidence level and a margin of error of 5%. How many products must he test