2022-2022英语周报课标XB答案

写作Dear TonyYou say you have dimeulty adap ting to the new study and life herelow exactly how you feel.(表示关心) You must be very anxious,butqui te normal since this is your first time to study in a foreig【高分句型-】 Just relax. First, break bearning goaIs into small stepsen get involved in school activities, wherou can make more friends.【高分句型二】(帮他分析原因Hopefully my sugsestions would be helpfum always the person youcan count on提供建议)s t

20.解:(1)平均分数为x=55×0.08 65×0.28 750.32 85×0.20 95×0.12=75(分)(2分)(2)根据频率分布直方图可知分数在[90,100]的人数为100×0.12=12人,男生4人,则女生8人(4分)可知随机变量=0,1,2,3,4,(6分可知P(:=0)P(=1)≈ClC224P(=2)C2CP(=3)=CC=83P(=4)=SC195可知分布列为4P14224需495495可知E()=0×14 1×24 2×56 3×32 4(8分)(3)根据频率分布直方图,可知包括90分及以上的频率为0.12,可知3000名学生中包括90分及以上的学生人数为,~B(3000,0.12),人数为3000×0.12=360,大约为360名学生

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