o****e
发帖数: 80 | 1 There are 30 people in my group. what are the odds that everybody was born
in the same decade (where a
decade is defined as any ten-year span, not necessarily "50s" or "60s" or "
70s" etc.)? |
J******d
发帖数: 506 | 2 这跟人的寿命的分布有关系吧。
假设一个人最多活10年，那这30个人同时活着就说明他们出生在同一个decade。
born
or "
【在 o****e 的大作中提到】
: There are 30 people in my group. what are the odds that everybody was born
: in the same decade (where a
: decade is defined as any ten-year span, not necessarily "50s" or "60s" or "
: 70s" etc.)?
|
m********0
发帖数: 2717 | 3 you made my day.
【在 J******d 的大作中提到】
: 这跟人的寿命的分布有关系吧。
: 假设一个人最多活10年，那这30个人同时活着就说明他们出生在同一个decade。
:
: born
: or "
|
p*****k
发帖数: 318 | 4 ogtree, as JunkFood indicated, you need some prior distribution info
of each person's age. for the simplest uniform prior, here is a very
nice detailed analysis:
http://www.mathpages.com/home/kmath124/kmath124.htm |
