Title: Elementary outcome
1???
2?????????
- Elementary outcome
- ????????????
????(Sample space) ?????,?????????
?? (Event) ?????????
3- 0!1 3!321 5!54321
- 100!1009998..321
- N!N(N-1)(N-2)(N-3).321
- ????
- Ex ???3????,5????,?
- 20???. ?????????? ???
- Ex ??????7???,3???,5??????,?2?????????.
????????????? -
-
4??????2??????
??? ??? ????
? ?
R2
(R1,R2)
P(R1 R2)7/106/9
R1
P(R2/R1)6/9
W2
P(R1)7/10
(R1,W2)
P(R1 W2)7/103/9
P(W2/R1)3/9
R2
(W1,R2)
P(W1 R2)3/107/9
W1
P(R2/W1)7/9
W2
(W1,W2)
P(W1 W2)3/102/9
P(W1)3/10
P(W2/W1)2/9
5???????,????36
? ? ?
1 2 3 4
5 6
1 2 3 4 5 6
(1,1) (1,2) (1,3) (1,4)
(1,5) (1,6)
? ? ?
(2,1) (2,2) (2,3) (2,4)
(2,5) (2,6)
(3,1) (3,2) (3,3) (3,4)
(3,5) (3,6)
(4,1) (4,2) (4,3) (4,4)
(4,5) (4,6)
(5,1) (5,2) (5,3) (5,4)
(5,5) (5,6)
(6,1) (6,2) (6,3) (6,4)
(6,5) (6,6)
6???????
- ??(Permutation)
- ?n??????,??????r???
-
- ??(Combination)
- ?n??????,?????,????
- r??????
- C
(n-r)!
n
n!
Pr
n!
n r
r!(n-r)!
7- Ex ???30????,??????
- ?20?????,??????
- ??20???????????
- Sol
- n30 r20
-
- P
-
-
30! 30! (30-20)! 10!
30
20
302928.321 1098321
8- Ex
- 7-11??????30????????,?????????????,???????????,?
????????? -
- C
-
30! 30! 12!(30-12)!
12!18!
30 12
302928.19 121110.321
9- Ex ?????200???, ????5???????,????????
- Ex?????200???, ????5???????, ???????????,????????
????,????? ????????,?????????????,?????????????.??
???????? -
10???????
N???????
???????
lim
n(E)??E????? n????????
???????
P(E)???E?????
11???????
????A??????? ????????
P(A)
12- Ex ??2???????????
- ?8??????
- Sol
- ??(E)(2,6) (6,2) (3,5) (5,3) (4, 4)
-
- P(E)
-
- ??????2,3,4,5,6,7,9,10,11,12,13??????
13 ????
- ??????B???????A???,????A?????
14- Ex
- ????3???,???????????,?????2?????????
- Ans
- ???????
- SBBB,GGG,BBG,BGB,GBB,BGG,GBG
- GGB n(S)8
- ???????, n(S)7
- P(2??? ?????)
15????
????
?????????????????,???????????????
16- Ex ?????100??????????,
- ????
???? ????? ?? 64
2 ?? 21 13
????????????? P(??
????)64/100 ?????????????? P(??
?????)13/100
17- ???? ????? ??
- ?? 64 2
66 - ?? 21 13
34 - ???????????????
- P(?????) n(?? ???)
-
n(??) - 21/34
-
18- ???? ????? ??
- ?? 64 2
66 - ?? 21 13
34
?????????????? ????????? P(????)P(????
???) P(???????)
64/10021/10085/100 P(?????) 15/100
19????????
- ?????
- ?A?B????????????,?A ?B????
-
-
-
20????????
- ????
- ???????????????????????
21- Ex ???????????, ????????
- (a) P(???)?
- (b) P(??)?
- (c) P (??????)?
- (d) P(??????A)?
- (e) P(??????)?
-
- ????????, P(????A)?
- P(????A)?
- P(????A????A)?
-
22Ex ?????,??10???????,7???, 3???
??,??????2?.??,????,???????? ??????(Tree
Diagram)
23??B?????,?A???P(A B)
n(s)
n(A B)
n(A B)
P(A B)
n(s)
n(B)
n(B)
n(s)
n(A B)
n(s)
n(B)
P(A B)
P(B)
? ? ? ?
or
P(A B)
P(B)
P(A B)
? ? ? ?
24n(A B)
????
P(A B)
n(B)
(??)
n(S)
n(A B)
n(B)
n(S)
n(S)
n(A B)
n(S)
n(B)
P(A B)
n(A B)
n(B)
/
P(B)
n(S)
n(S)
P(A)
P(B)
P(A)
P(B)
25?????3000???,???2000?
?1000?,?????600?,?????50?
Sex Smoke Non-Smoke total
F 50 950 1000
M 600 1400 2000
_at_????????30,?????5???,??????????????????or?,????
???????
26P(A B1)
P(B1
A)
P(A)
P(A)P(A
B1)
P(B1)P(A B1)P(B2)P(A B2)
A
B1
B2
272000
2
P(M)
(????,??????)
3000
3
?????
P(M S) (??)
???????0.3
P(S M)0.3
P(M S)
P(S M) P(M)
P(S M)
P(S)
P(M S)P(F S)
P(S M) P(M)
0.3?
P(S M)P(M)P(S F)P(F)
0.3?0.05?
28? ? ? ? ??????????????, ?????????
P(A) P(B A)
P(A B)
P(A)P(B A)P(C)P(B C)
A,C???? ,P(A)????
P(A B) ,P(C B)????
29????
30? ? ? ? ? ? (5?1)
? ? ? ?0.4, ? ? ?,? ? ?
? ? ? ? 1/5
? ? ? ? ? ?(??)
? ?,? ? ? ? ? ? ? ??
31A? ? ? ? ? ? ?
B ? ? ? ? ? ? ? ?
G ? ? ? ? ? ? ?
A
B
P(A)0.4 P(B)1-0.40.6
P( \B)0.2 P(G\A)1
32P(A G)
P(A G)
P(G)
P(A)P(G A)
P(A)P(G A)P(B)P(G B)
0.4
1
0.4
0.52
0.4 10.6 0.2
0.7692
???(???)76.92,???,????23.08
33UE1 E2 E 3 E 4
P(Ei)????????
S
E1
E4
E3
E2
P(E1 S)
P(E1 S)
(???,??E1?????)
P(S)