数据的收集和整理是中考的重要考点之一．中考主要考查对有关概念的掌握程度和挖掘图形信息解决问题的能力．现以2006年中考试题为例予以说明．一、用样本估计总体例1 (2006年兰州市)为了估计湖中有多少条鱼,先从湖中捕捞50条鱼做记号,然后放回湖中,等带有记号的鱼完全混于鱼群中之后,第二次再捕捞200条鱼,其中有10条做了记号,则估计湖中有鱼( )． The collection and arrangement of data is one of the important test points in the examination. The examination mainly examines the mastery of the concept and the ability to mine graphical information to solve problems. Now take the middle school exam in 2006 as an example to illustrate. I. Estimating population samples using samples 1 (2006, Lanzhou City) To estimate how many fishes there are in the lake, first catch 50 fish from the lake and mark them, and then put them back into the lake and wait for the marked fish to mix completely with the fish. After the group, 200 fish were fished again for the second time. Among them, 10 had been marked, and it was estimated that there was fish in the lake ( ).