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TRPGコラム

確率の話(D20系)

nD20のうち最小の出目の出現率

[表部分はスクロールが可能です]

1D202D203D204D205D20
15%9.75%14.263%18.549%22.622%
25%9.25%12.838%15.841%18.329%
35%8.75%11.488%13.409%14.678%
45%8.25%10.213%11.241%11.603%
55%7.75%9.013%9.319%9.038%
65%7.25%7.888%7.631%6.923%
75%6.75%6.837%6.159%5.204%
85%6.25%5.863%4.891%3.827%
95%5.75%4.962%3.809%2.743%
105%5.25%4.138%2.901%1.908%
115%4.75%3.388%2.149%1.280%
125%4.25%2.713%1.541%0.821%
135%3.75%2.113%1.059%0.499%
145%3.25%1.588%0.691%0.282%
155%2.75%1.138%0.419%0.145%
165%2.25%0.762%0.231%0.066%
175%1.75%0.462%0.109%0.024%
185%1.25%0.238%0.041%0.007%
195%0.75%0.087%0.009%0.001%
205%0.25%0.013%0.001%0.000%

nD20で値以下が出る確率

[表部分はスクロールが可能です]

1D202D203D204D205D20
1以下5%9.75%14.263%18.549%22.622%
2以下10%19%27.1%34.39%40.951%
3以下15%27.75%38.588%47.799%55.629%
4以下20%36%48.8%59.04%67.232%
5以下25%43.75%57.813%68.359%76.270%
6以下30%51%65.7%75.99%83.193%
7以下35%57.75%72.538%82.149%88.397%
8以下40%64%78.4%87.04%92.224%
9以下45%69.75%83.363%90.849%94.967%
10以下50%75%87.5%93.75%96.875%
11以下55%79.75%90.888%95.899%98.155%
12以下60%84%93.6%97.44%98.976%
13以下65%87.75%95.713%98.499%99.475%
14以下70%91%97.3%99.19%99.757%
15以下75%93.75%98.438%99.609%99.902%
16以下80%96%99.2%99.84%99.968%
17以下85%97.75%99.663%99.949%99.992%
18以下90%99%99.9%99.99%99.999%
19以下95%99.75%99.988%99.999%100.000%

TORGの出目

 意外なことに、技能があって萎縮していないときであれば、約3000回(2745.484964…回)に1回は、ポシビリティ無しで偉業が出ます。計算を間違えていないかどうかを疑っているんですけど……誰か教えて(泣)。

[表部分はスクロールが可能です]

10のみ振り足し10と20で振り足し
出現率累計出現率累計
15%5%5%5%
25%10%5%10%
35%15%5%15%
45%20%5%20%
55%25%5%25%
65%30%5%30%
75%35%5%35%
85%40%5%40%
95%45%5%45%
10----
115.25%50.25%5.25%50.25%
125.25%55.5%5.25%55.5%
135.25%60.75%5.25%60.75%
145.25%66%5.25%66%
155.25%71.25%5.25%71.25%
165.25%76.5%5.25%76.5%
175.25%81.75%5.25%81.75%
185.25%87%5.25%87%
195.25%92.25%5.25%92.25%
205%97.25%--
210.263%97.513%0.513%92.763%
220.263%97.775%0.513%93.275%
230.263%98.038%0.513%93.788%
240.263%98.3%0.513%94.3%
250.263%98.563%0.513%94.813%
260.263%98.825%0.513%95.325%
270.263%99.088%0.513%95.838%
280.263%99.35%0.513%96.35%
290.263%99.613%0.513%96.863%
300.25%99.863%--
310.013%99.876%0.288%97.151%
320.013%99.889%0.288%97.439%
330.013%99.902%0.288%97.727%
340.013%99.915%0.288%98.015%
350.013%99.928%0.288%98.303%
360.013%99.941%0.288%98.591%
370.013%99.954%0.288%98.879%
380.013%99.968%0.288%99.168%
390.013%99.981%0.288%99.456%
400.013%99.993%--
410.001%99.994%0.040%99.496%
420.001%99.994%0.040%99.536%
430.001%99.995%0.040%99.576%
440.001%99.996%0.040%99.616%
450.001%99.996%0.040%99.656%
460.001%99.997%0.040%99.696%
470.001%99.998%0.040%99.736%
480.001%99.998%0.040%99.776%
490.001%99.999%0.040%99.816%
500.001%100.000%--
510.000%100.000%0.016%99.832%
520.000%100.000%0.016%99.849%
530.000%100.000%0.016%99.865%
540.000%100.000%0.016%99.882%
550.000%100.000%0.016%99.898%
560.000%100.000%0.016%99.914%
570.000%100.000%0.016%99.931%
580.000%100.000%0.016%99.947%
590.000%100.000%0.016%99.964%
600.000%100.000%--
610.000%100.000%0.003%99.966%
620.000%100.000%0.003%99.969%
630.000%100.000%0.003%99.972%
640.000%100.000%0.003%99.975%
650.000%100.000%0.003%99.978%
660.000%100.000%0.003%99.981%
670.000%100.000%0.003%99.983%
680.000%100.000%0.003%99.986%
690.000%100.000%0.003%99.989%
700.000%100.000%--
710.000%100.000%0.001%99.990%
720.000%100.000%0.001%99.991%
730.000%100.000%0.001%99.992%
740.000%100.000%0.001%99.993%
750.000%100.000%0.001%99.994%
760.000%100.000%0.001%99.995%
770.000%100.000%0.001%99.996%
780.000%100.000%0.001%99.997%
790.000%100.000%0.001%99.998%
800.000%100.000%--
810.000%100.000%0.000%99.998%
820.000%100.000%0.000%99.998%
830.000%100.000%0.000%99.998%
840.000%100.000%0.000%99.998%
850.000%100.000%0.000%99.999%
860.000%100.000%0.000%99.999%
870.000%100.000%0.000%99.999%
880.000%100.000%0.000%99.999%
890.000%100.000%0.000%99.999%
900.000%100.000%--
910.000%100.000%0.000%99.999%
920.000%100.000%0.000%99.999%
930.000%100.000%0.000%100.000%
940.000%100.000%0.000%100.000%
950.000%100.000%0.000%100.000%
960.000%100.000%0.000%100.000%
970.000%100.000%0.000%100.000%
980.000%100.000%0.000%100.000%
990.000%100.000%0.000%100.000%
1000.000%100.000%--

人事を尽くして天命を待つ。

[最終更新日 2015.7.15]