某次考试共有9道题,做对1-9题的人数分别占参加考试人数的82% ,65%% ,92% ,93% ,68% ,98% ,70% ,60% ,72% .如果做对5道或5道以上为及格,那么这次考试的及格率至少是多少?
人气:152 ℃ 时间:2020-09-22 18:24:01
解答
1-82%=18% 1-65%=35%1-92%=8% 1-93%=7% 1-68%=32% 1-98%=2% 1-70%=30% 1-60%=40%1-72%=28%18%+35%+8%+7%+32%+2%+30%+40%+28%=200%200%÷5=40%1-40%=60%这次考试的及格率最少是60%
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