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八卦一下， 为啥希尔顿的胸部可大， 可小呀？
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八卦一下， 为啥希尔顿的胸部可大， 可小呀？# Fashion - 美丽时尚
r*d
1 楼
我付钱让对方扔骰子（6面），对方按点数付给我钱。一共可以扔两次。第一次扔完，
我有机会说接受或者拒绝。接受的话，对方按照第一次点数付我钱。拒绝的话，对方扔
第二次，扔完按照第二次点数付钱。
问题是我最多付多少钱，保证我不亏本？
今天面试问到的，应该是统计方面的问题，（linear programming)？我没有统计背景
，（搞化学的）。
这道题是基于之前的一道题，只能扔一次骰子，我最多付多少钱。---3.5 这个倒是很
简单。
但第二道题，我就晕了。然后面试的人问我是大于3.5还是小于，我竟然说小于。。。
现在真想抽自己。。。
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b*l
2 楼
On March 12, 2012, we ordered production of your new card. Please allow 30
days for your card to be mailed to you. If we need something from you we
will contact you. If you move before you receive the card, call customer
service at 1-800-375-5283.
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o*i
3 楼
求科普
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t*o
4 楼
为啥希尔顿的胸部可大， 可小呀？太神奇了。。
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k*a
5 楼
4块钱
如果第一次1,2,3 那么再扔，这样 epxpected 3
如果第一次4,5,6, 那么就不扔了，这种情况 expected 5
所以这种策略 expected = 4
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p*r
6 楼
BLS
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m*r
7 楼
某烙印民间组织？
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n*y
8 楼
push
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r*d
9 楼
谢谢回答。
为什么第一次不是2呢？ （ = 1/3（1+2+3））
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x*0
10 楼
绿了，等包子！
恭喜！
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k*a
12 楼
我搞错了
第一次应该 expected （1+2+。。+6）/6=3.5
所以总的expectation是 (3.5+5)、2=4.25

【在 r*****d 的大作中提到】
: 谢谢回答。
: 为什么第一次不是2呢？ （ = 1/3（1+2+3））
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m*n
13 楼
cong
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z*y
14 楼
Indian Vain
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t*h
15 楼
the key question is when do you say yes/no to first toss

【在 k*******a 的大作中提到】
: 4块钱
: 如果第一次1,2,3 那么再扔，这样 epxpected 3
: 如果第一次4,5,6, 那么就不扔了，这种情况 expected 5
: 所以这种策略 expected = 4
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w*1
16 楼
cong
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c*m
17 楼
我以为是罗马数字4，不如叫小四好了，比小三还低一个级别
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j*y
18 楼
用这种方式算出来是 4.25
怎么证明这个方式是最优的呢？

【在 k*******a 的大作中提到】
: 4块钱
: 如果第一次1,2,3 那么再扔，这样 epxpected 3
: 如果第一次4,5,6, 那么就不扔了，这种情况 expected 5
: 所以这种策略 expected = 4
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f*l
19 楼
cong
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k*a
20 楼
X: first result
Y: second result
I(X): decision on whether or not continue tossing after observing X
1 - stop 0 - continue
Eexpectation = E[I(X)X + (1-I(X))Y], since X and Y independet
= 3.5 + E[(X-3.5)I(X)]
to maximize expectation when (X-3.5) < 0 let I(X)=0
when (X-3.5) >0 let I(X) = 1

【在 j*****y 的大作中提到】
: 用这种方式算出来是 4.25
: 怎么证明这个方式是最优的呢？
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b*l
21 楼
I do not have any baozi. XieXie! Wish all of you green soon!
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j*y
22 楼
thanks.

【在 k*******a 的大作中提到】
: X: first result
: Y: second result
: I(X): decision on whether or not continue tossing after observing X
: 1 - stop 0 - continue
: Eexpectation = E[I(X)X + (1-I(X))Y], since X and Y independet
: = 3.5 + E[(X-3.5)I(X)]
: to maximize expectation when (X-3.5) < 0 let I(X)=0
: when (X-3.5) >0 let I(X) = 1
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a*o
23 楼
cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
r*d
24 楼
嗯 我也明白怎么回事了
谢谢

【在 k*******a 的大作中提到】
: X: first result
: Y: second result
: I(X): decision on whether or not continue tossing after observing X
: 1 - stop 0 - continue
: Eexpectation = E[I(X)X + (1-I(X))Y], since X and Y independet
: = 3.5 + E[(X-3.5)I(X)]
: to maximize expectation when (X-3.5) < 0 let I(X)=0
: when (X-3.5) >0 let I(X) = 1
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T*X
25 楼
恭喜
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F*a
26 楼
cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
T*y
27 楼
big cong!

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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f*2
28 楼
congrats!
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w*g
29 楼
Cong
avatar
w*s
30 楼
恭喜恭喜~~~

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
b*r
31 楼
CONG

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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n*z
32 楼
cong!
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J*m
33 楼
Cong
zhan
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a*n
34 楼
GXGX!!
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q*1
35 楼
cong
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B*o
36 楼
绿了，恭喜！
★ Sent from iPhone App: iReader Mitbbs Lite 7.39
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c*8
37 楼
cong.RD?TSC?
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p*l
38 楼
gx
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a*1
39 楼
gxgx
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k*e
40 楼
gx
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S*y
41 楼
cong
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g*3
42 楼
恭喜
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l*z
43 楼
big cong!
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z*i
44 楼
恭喜
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h*l
45 楼
祝贺

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
M*m
46 楼
Gxgx

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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n*z
47 楼
cong!
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m*r
48 楼
GXGX
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c*9
49 楼
恭喜
avatar
l*G
50 楼
gx

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
z*b
51 楼
cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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s*y
52 楼
恭绿
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k*3
53 楼
gxgx
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g*1
54 楼
恭喜
坐等包子
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r*e
55 楼
cong
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f*m
56 楼
gx
avatar
G*y
57 楼
cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
s*a
58 楼
cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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y*z
59 楼
Cong!!!
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g*r
60 楼
yes,it is

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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w*s
61 楼
gxgx~~~~~~~~~~

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
l*G
62 楼
gx

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
i*t
63 楼
恭喜

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
avatar
e*g
64 楼
Cong!

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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z*i
65 楼
cong
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h*7
66 楼
cong.
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g*3
67 楼
congrat!
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y*8
68 楼
Big cong

【在 b*********l 的大作中提到】
: On March 12, 2012, we ordered production of your new card. Please allow 30
: days for your card to be mailed to you. If we need something from you we
: will contact you. If you move before you receive the card, call customer
: service at 1-800-375-5283.
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