更新1:
Suppose the male washroom of a shopping mail is closed for 30 mins for cleaning between 14:00pm and 16:00 pm at random
If a man goes to the washroom at 15:40, find the probability that the washroom is closed for cleaning ?
回答 (1)
2018-05-31 5:47 pm
30/120=1/4=25%
收錄日期: 2021-04-18 18:08:08
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20180524005046AAxnXX3