close
標題:
1975 CE probability
發問:
In a group of 140 students , 70 are taking mathematics , 50 are taking physics and 30 are taking both subjects .(i) How many students are taking neither mathematics nor physics?(ii) How many students are taking either mathematics or physics but not both?(iii) If a student is picked at random, what is the... 顯示更多 In a group of 140 students , 70 are taking mathematics , 50 are taking physics and 30 are taking both subjects . (i) How many students are taking neither mathematics nor physics? (ii) How many students are taking either mathematics or physics but not both? (iii) If a student is picked at random, what is the probability that he is taking physics but not mathematics? (iv) If, among the students not taking physics, a student is picked at random, what is the probability that he is taking mathematics? thanks a lot for your help~
最佳解答:
i)140-70-50+30 =50 students ii)70-30+50-30 =60 students iii)(50-30)/140 =1/7 iv)(70-30)/(140-50) =4/9
其他解答:
1975 CE probability
發問:
In a group of 140 students , 70 are taking mathematics , 50 are taking physics and 30 are taking both subjects .(i) How many students are taking neither mathematics nor physics?(ii) How many students are taking either mathematics or physics but not both?(iii) If a student is picked at random, what is the... 顯示更多 In a group of 140 students , 70 are taking mathematics , 50 are taking physics and 30 are taking both subjects . (i) How many students are taking neither mathematics nor physics? (ii) How many students are taking either mathematics or physics but not both? (iii) If a student is picked at random, what is the probability that he is taking physics but not mathematics? (iv) If, among the students not taking physics, a student is picked at random, what is the probability that he is taking mathematics? thanks a lot for your help~
最佳解答:
i)140-70-50+30 =50 students ii)70-30+50-30 =60 students iii)(50-30)/140 =1/7 iv)(70-30)/(140-50) =4/9
其他解答:
此文章來自奇摩知識+如有不便請留言告知
文章標籤
全站熱搜
留言列表
