A Probability Problem of Using a Washing Machine

Last night when coming back to the dorm,
I kept thinking probability problems.

I put clothes into the washing machine,
meanwhile, I was thinking:
There're 8 rooms each row, so there're 8*4=32 people totally.
Given that every one has identical frequency of washing clothes.
and given that no one wash their clothes in midnight and on the early morning,
all people wash clothes only in 24-16=8 hours.

Therefore, there're 32/7/16=0.29 people per hour averagely.
So about 0.21 people per 45 minutes.
Next we assumt that the washing events between people are mutually indepent,
It's a Poisson Distribution.

So when you go washing your clothes,
the probability of seeing an empty washing machine
(i.e., you can use it right away)
equals to the probability that no one use the machine
in the last 45 minutes,
which is about p(0)=exp(-0.21)=0.81

Conclusively, you will see an empty washing machine
around 4 times per 5 times averagely.

對話一則

邦頭：我明天開始要好好作研究


興哥：我明天開始要好好作一個人
















（一片靜默）












邦頭：你就不能想簡單一點的事情嗎？

肚子與橘子

深夜，624寢室三個人的肚子咕咕叫
但他們試著若無其事，試著不為所動
試著為擁腫的身體，減輕那麼一絲絲的體重

禁不住飢餓的小諾，拿出了一個橘子
哀怨的放在桌上
矛盾的他不知道該吃還是不該吃

這種情況，莎士比亞就曾說過
To eat, or not to eat
this is the question!!!!

橘子，一種富含維他命c的果實
難道不是拿來吃的嗎?
肚子，一種人類的器官
難道不是拿來享受美食的嗎?
肥胖是一種罪嗎?
深夜吃橘子是一種罪嗎?

在世界的中心呼喊餓，是一種罪嗎?



「看著橘子 我哭了」

在一片靜默中，他幽幽的說


育群與我，望了望桌上的橘子，再看了看自己的肚子
不約而同的流下了一把同情淚。