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1号卷.A10联盟2022届高三11月段考答案
6+7+8+9+1019.解:(1)可知x8,yA40+50+100+150+160=100,分(x-x)(y-y)可得b(6-8)(40-100)+(7-8)(50-100)+0+(9-8)(150-100)+(10-8)(160-100)+1+0+1+22=34,…………………14分代人a=y-bx可得,a=y-bx=100-34×8=-172,故回归直线的方程为y=34x-172,………5分预计1月20日当天可以销售y=34×20-172=508(件);…6分(2)可知:=40,35,3025,207分P=0)(号-1P(=3)-33P(=30=(3(3-3,Pe=25)=×3(-备P(=30)=(3(2)2()=81,P(e=25)=C×2(1)=82481P(=20)=(4()°()4=1,…………9分可知分布列为402520P16328∴E()=40×01+35×1+30×5+25×+20×言≈33(元)12分
1号卷.A10联盟2022届高三11月段考答案
書面表達The Most Beautiful WorkersThe most impressive workers that come to my mind are firefighters. Wheneverthere is a fire, they will put it out at all eventsI thought firefighters were nothing special before, however, something changedmy view. About two months ago, I heard the news that there was a big fire burming inthe forest and about ten firefighters were dead during the rescue. They were veryyoung, and some of them were at my age, which moved me deeply and made merealize that I shouldn’t t have taken the peaceful life for grantedSince then. I have considered firefighters”the most beautiful workers” due to thecontributions mey make. I must, in the future, make my own contributions to oursociety like them聽力材料