1. An insurance company has a paper record and an electronic record for every claim. For an inaccurate paper record, 60% chances that the electronic record is inaccurate. For an inaccurate electronic record, 75% chances that the paper record is inaccurate. 3% of all the claims are inaccurate both in paper record and in electronic record. Pick one claim randomly, what are the chances that it is both accurate in paper record and in electronic record?
A.97% B.94% C.68% D.65% E.35%作者: redli 时间: 2002-12-19 23:28
选B，对吗？
设“inaccurate paper record”为X， inaccurate electronic record 为Y，
则：0.6Y=0.03 0.75X=0.03,算出X+Y=0.09,
答案:1-(0.09-0.03)=0.94作者: Louisa_xy 时间: 2002-12-19 23:36
