The university book shop selects 200 of its more than 8000 customers to participate in a study on service quality in the shop. The book Shop has established a __________ for use in its research.

Sample

A sample is a subset of a larger population selected for research purposes. In this case, the university bookshop selects 200 customers from a total of more than 8000 customers, making it a sample used for studying service quality.

• Point A is 30 metres to the east of point B. Point C is 10 metres to the south of Point A. Point D is 15 metres to the west of Point C. Point E is exactly in the middle of the Points D and F. Points D, E and F lie in a straight line. The length of the lin
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• There are three taps A, B and C in a tank. They can fill the tank in 25 hrs, 20 hrs and 10 hrs respectively. At first all of them are opened simultaneously. Then after 1 hrs, tap C is closed and tap A and B are kept running. After the 4th hour, tap B is a
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