英语周报高一牛津综合2019 2022 30期答案

18.(12分)解:(1)根据题意设女顾客满意的有x人.结合列联表知P=45+x5105-7,解得x=30于是可完成2×2列联表如下:满意不满意总计男顾客410女顾客3050总计7301053分(2)根据列联表中的数据可以得到K2的观测值,即Kx2=mad-b)y105(45×20-10×30)2≈6.109>3.841,…6分(a+bc+da+c(b+d)55×50×75×30由此可以判断能在犯错率不超过5%的前提下认为满意度与性别有关系…7分(3)不满意的男性10人,女性20人,共30人,因此抽取的9人中,男性为9x03人,女性为9×==6人,…19分从9人中任取3人的情况有C9×8x784种10分3×2×1其中3人性别相同的情况有1+C=21种,11分所以,3人性别不全相同的概率为P=121312分844

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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