2022英语周报35OJS答案

第三节One possible versionParagraph 1Finally, afler struggling for a minute or tuo, I still gotpulled underwater. I told myself I should never give upThen I pulled the weed again with great efforts. The weedfinally broke. I swam back to the surface to take a deepbreath. I saw two young men in canoes, racing each otherI was exhausted and shouted for help. The two men saw meand raced towards me. By the time they reached me, I hadbeen already unconsciousParagraph 2When I woke up, I was in an empty room lying on abed. It was not until a doctor came into the room that I realized that I was in a hospital. Jimmy and bobby told me thetwo young men brought me to the shore and sent me to thehospital. After a few minutes, my parents with half angryand half worried faces walked in. My parents scolded mefor running out of the house secretly but were also glad thatI was not seriously injured. I will never forget that terrifyingexperience. Neither will I ever want to show off again

18.解:(1)由题得,x=(0.005×35+0.01×45+0.01555+0.03×65+0.02×75+0.015×85+0.00595)×10=66.5,(4分)故(x-25,x+2s)=(36.5,96.5),因为100∈(36.5,96.5),故该零件属于”不合格”的零件(6分)(2)用分层抽样的方法从样本的前3组中抽出6个零件,则[30,40)中取1个,[40,50)中取2个,[50,60)中取3个,分别记为A1B1,B2,C1,C2,C3,从中任取两个,所有可能结果有:(A1,B1),(A1,B2),(A1,C1),(A1,C2),(A1,C3),(B1,B2),(B1,C1),(B1,C2),(B1,C3),(B2,C1),(B2,C2),(B2,C3),(C1C2),(C1,C3),(C2,C3),共15种,满足条件的有(A1,C1),(A1,C2),(A1,C3),(B1C1),(B1,C2),(B1,C3),(B2,C1),(B2,C2),(BC3),共9种,93故所求概率P=15(12分)

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