86 61
160 5
(6 50
19
(6 51
1 x X X
x 100%
x PX P X x 100 P X x 100 0
x
100
Z P(Z 0) 0.5
P(Z 0) 100 (0.5)(100) 50
50
(6
1 ) 791
95
P(Z 1.645) 0.95
(6 53
21 100 75
73 16
70 10
(6 54
22 55
–
23
74 65
68
(6 55
1Z 56
P(Z 1.34)
P(Z 2.18)
P( 2.45 Z 1.68)
P(0.91 Z 2.26)
(6
1 10
3 57
X N 20,100
1 ) P X 48.9
) P X 12.9
3 P 18.5 X 37.4
(6
1 ) 538 58
179
3 356
4
(6
1
1
3 ) 14
1 600 505 111
1 400
59
(6
) 700
3 ) 450
7 6
P Z 1.2816 0.90 P Z 0.6745 0.25
90
(6 60
1
1 ) 30
(6 61
3
4
1
(6
11
8,400 360
9,500 6,000
75 55 13
68 50 10
(6 63
13 6
4 1.5
3 0.5 , 1.5
2 0.5 , 0.5
1 1.5 , 0.5
0
1.5
1
(6 64
– 65
1
160
3 180
(6
X N(20, 4) 66
X N(50,100)
P(X 35)
P(X 55)
(6
P(20 X 80)
X N(80,225) k P(65 X k) 0.7357
X N(100,64) 67
P(X 92)
(6
P(94 X 106)
P(102 X 110)
X N(25, 36) P(20 X 35)
(6 68
X N(120,225) P(X 130) P(93 X 140)
11 69
11
(6
11
(6 70
–
P(Z 2.054) 0.98 71
(6
1 59 68 169
2 39
3 53 60
(6
500 73
(6
X 74
5
(6
X N( , 2) A B, C D P(X x)
3 1 x D
10
10 3 C
B 6
(6 75
11, 14
11,4
(6 76
(6 77
538 78
179
(6
356
(6 79
P(Z 0.6745) 0.75 ( )
(6 80
8,
5,
9,
P(Z 0.6745) 0.25 P(Z 1.2816) 0.9
(6 81
(6
z0
z 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1
-1.1
-1.2
-1.3
-1.4
-1.5
-1.6
-1.7
-1.8
-1.9
-2
-2.1
-2.2
-2.3
-2.4
-2.5
-2.6
-2.7
-2.8
-2.9
-3
(6 83
()
0z
z 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3
(6 84