英语周报2021-2022 17答案

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17.(本小题满分12分)解:(1)根据列歌表,E21000×(5×580-20×395)(5 395)(20 580)(5 20(395 580)1000(1×116-4×79≈4.27480×120×5×1958×6×195在附表中,犯错概率0.05与观测值3.841对应,犯错概率0.025与观测值5024对应,3.841<4.274<5024所以有95%的把握认为人们对新冠肺炎病毒的抵抗力与是否坚持体育锻炼有关(6分)记坚持体育锻炼的一人为a,其他四人为b,c,d,e,试卷参家》(2)根据列联表,在按照分层抽样抽取的5个阳性人员中,恰坚持体育锻炼,从5人中抽取两人,列举所有的抽法得ab,ac,adye,bc,bd,be,cd,ce,de,共10种,其中含a的有且仅有4种记“从抽取的5位阳性人员中再随机抽取人,恰好有一人坚持体育锻炼”为事件,,则P(4)(12分)

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