2022广州英语周报八年级综合复习答案

19.解:(1)列出列联表如下:非高薪收入群体拌体高薪收入群合计「A专业230B专业0320400合计F2=400×(150×60-170×20)2=419012.582>10.828,170×230×320X80所以有9.9%以上的把握认为“高薪收人群体”与所学专业有关4分(2)①月薪频率分布表如下:月薪(百元人数[40,50)[50,60)[60,70)[70,80)[8.90)[9o,10频率0.1100020.2560将样本的频率视为总体的概率,该大学2019届的大学本科毕业生平均工资为:0.250.150.05P=45×0.1+55×0.2+65×0.25+75×0.25+85×0.15+95×0.05=68∵月薪X~N(,225),∴。2=225,0=15,6分-a=68-15=532019届大学本科毕业生张明的月薪为4500元=45百元<4-=53百元,故张明属于“就业不理想”的学生………②由①知p=68百元=6800元,故张明的工资为4500元,低于p,可获赠两次随机话费,所获得的话费z的取8分值分别为200,300,400,500,600,P(z=20P(x=500=2××=3,P(x=60)=×=,故z的分布列为P则张明预期获得的话费为E()=20×230×03+0×0+50×02+8020元.12分

读后续写 One possible version)A bad guy just p/cked Kim up and took her away! yelled Julie. So shocked were Kims parents thatthey jumped up from the sofa and rushed over to Julie. Learning what had happened, they phoned thepolice without delay. The nextnt, they jumped into their car and drove off directed by Julie. By thenT had reached the alley, but the man was nowhere to be seen. "I must find Kim, "TJ said to himself. Heran along the alley to the end, where he spotted the man walking towards a white house. "Stop! Stop Withhese words, he charged at the guy fearlessly and held fast to Kim. However hard the guy tried to get rid ofTJ. TJ wouldnt give inAt that very moment, Kim s parents arrived. Help! Help! "TJ shouted. Immediately Kim's father tookoff toward the guy. Seeing this. he guy hurriedly let go of Kim and broke into a run. Kim's father dashedup, caught hold of him and pressed him to the ground. Kim ran crying into her mother s arms. Minutes later,the police arrived and arrested the guy. TJ breathed a sigh of relief and smiled happily. T]'s quick thinkingand bravery saved a little girl in the neighborhood from unimaginable consequences

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