要聽日交!緊急,做1題都可以~
1.what is the probability that a 2-dight number chosen at random is diivisble by 11?
2.a dice and a coin are tossed.find the probability of getting an oddnumber and a head.
3.in a group of 300 students,150 of them have brown eyes,45 have blue eyes and the rest have green eyes,if a person is chosen at rendom from these 300 students,find probability that the person
(i)has blue eyes
(ii)has green eyes
請用英文打出尼~
很緊急,做maths,5識做 thx
2011-05-17 7:25 am
回答 (1)
2011-05-17 7:31 am
✔ 最佳答案
1. P(a 2-dight number chosen at random is diivisble by 11) = 9/90 = 1/102. P(odd number) = 3/6 = 1/2 ; P(a head) = 1/2
P(an odd number and a head) = 1/2 x 1/2 = 1/4
3. P(has blue eyes) = 45/300 = 3/20
P(has green eyes) = (300-150-45)/300 = 105/300 = 7/20
收錄日期: 2021-04-13 17:59:28
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110516000051KK01308