英语周报2022-2022高三答案

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!

17解:(1)因为频数〓样本容量X频率,且一天上网学习时间在[999,119.9)分钟之间的学生所占的频率为0.35,(2分)所以这一天上网学习时间在[99.9,119.9)分钟之间的学生人数为40×0.35=14(人)(3分)(2)40名学生的线上平均学习时间的估计值为0.15×69.9+0.25×89.9+0.35×109.9+0.20×129.9+0.05×149.9=104.9(分)(5分)因为在中位数左边和右边的小长方形的面积和是相等的,且(0.0075+0.0125)×20=0.4,所以中位数在区间[999.1199)上,设中位数靠近左侧的长度为x,则0.15+0.25+0.35×x20解得x≈5.7,(8分)所以中位数的估计值是99.9+5.7=105.6(分).(9分)(3)不合理因为该样本的选取只在高一某班,不具有代表性,所以这样推断不合理(10分)

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