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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
书面表达TheMostBeautifulWorkersThemostimpressiveworkersthatcometomymindarefirefighters.Wheneverthereisafire,theywillputitoutatalleventsIthoughtfirefighterswerenothingspecialbefore,however,somethingchangedmyview.Abouttwomonthsago,Iheardthenewsthattherewasabigfireburmingintheforestandabouttenfirefightersweredeadduringtherescue.Theywereveryyoung,andsomeofthemwereatmyage,whichmovedmedeeplyandmademerealizethatIshouldn'tthavetakenthepeacefullifeforgrantedSincethen.Ihaveconsideredfirefighters""themostbeautifulworkers""duetothecontributionsmeymake.Imust,inthefuture,makemyowncontributionstooursocietylikethem听力材料
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