计算方法：假定每次平均中签率为2.5%，套用二项分布公式，计算出摇n次中签概率表如下
摇n次 中签概率
1 2.50%
2 4.94%
3 7.31%
4 9.63%
5 11.89%
6 14.09%
7 16.24%
8 18.33%
9 20.38%
10 22.37%
11 24.31%
12 26.20%
13 28.05%
14 29.84%
15 31.60%
16 33.31%
17 34.98%
18 36.60%
19 38.19%
20 39.73%
21 41.24%
22 42.71%
23 44.14%
24 45.54%
25 46.90%
26 48.23%
27 49.52%
28 50.78%
29 52.01%
30 53.21%
31 54.38%
32 55.52%
33 56.63%
34 57.72%
35 58.77%
36 59.81%
37 60.81%
38 61.79%
39 62.75%
40 63.68%
41 64.58%
42 65.47%
43 66.33%
44 67.18%
45 68.00%
46 68.80%
47 69.58%
48 70.34%
49 71.08%
50 71.80%
51 72.51%
52 73.19%
53 73.86%
54 74.52%
55 75.15%
56 75.78%
57 76.38%
58 76.97%
59 77.55%
60 78.11%
61 78.66%
62 79.19%
63 79.71%
64 80.22%
65 80.71%
66 81.19%
67 81.66%
68 82.12%
69 82.57%
70 83.00%
71 83.43%
72 83.84%
73 84.25%
74 84.64%
75 85.03%
76 85.40%
77 85.77%
78 86.12%
79 86.47%
80 86.81%
81 87.14%
82 87.46%
83 87.77%
84 88.08%
85 88.38%
86 88.67%
87 88.95%
88 89.23%
89 89.49%
90 89.76%
91 90.01%
92 90.26%
93 90.51%
94 90.74%
95 90.98%
96 91.20%
97 91.42%
98 91.64%
99 91.84%
100 92.05%
101 92.25%
102 92.44%
103 92.63%
104 92.81%
105 92.99%
106 93.17%
107 93.34%
108 93.51%
109 93.67%
110 93.83%
111 93.98%
112 94.13%
113 94.28%
114 94.42%
115 94.56%
116 94.70%
117 94.83%
118 94.96%
119 95.08%
120 95.21%
努力加油吧！！