书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

18.解:(1)样本中男生总共25人,其中选择体育类项目的有5人,故在男生中男生选择体育类项目的概率p=2=…2分(2)令从1000名学生中随机抽取的50名学生中有x人选择体育类项目,则x+x+10=50,所以x=20(人).…4分完成2×2列联表如下:选择体育类项目不选择体育类项目合计男生57分50(5×10-15×20)225×25X20X302510分因为8.333>7.879,所以在犯错率不超过0.005条件下有99.5%的把握认为“选择体育类项目”与“性别”有关12分

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