Tables of Poisson Cumulative Distribution

The following tables provide the Cumulative Distribution Function (CDF) for a Poisson random variable \( X \). For a given mean = \( \lambda \), each cell represents the probability that the number of events \( X \) is less than or equal to a specific value \( x \).

P(Xx)=r=0xλreλr!P(X \le x) = \sum_{r=0}^{x} \frac{\lambda^re^{-\lambda} }{r!}

Table 1: Cumulative Poisson Probabilities (λ = 0.1 to 1.0)
x Mean (λ)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
00.90480.81870.74080.67030.60650.54880.49660.44930.40660.3679
10.99530.98250.96310.93840.90980.87810.84420.80880.77250.7358
20.99980.99890.99640.99210.98560.97690.96590.95260.93710.9197
31.00000.99990.99970.99920.99820.99660.99420.99090.98650.9810
41.00001.00001.00000.99990.99980.99960.99920.99860.99770.9963
51.00001.00001.00001.00001.00001.00000.99990.99980.99970.9994
61.00001.00001.00001.00001.00001.00001.00001.00001.00000.9999
71.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
81.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
91.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
101.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
Table 2: Cumulative Poisson Probabilities (λ = 1.1 to 2.0)
x Mean (λ)
1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
00.33290.30120.27250.24660.22310.20190.18270.16530.14960.1353
10.69900.66260.62680.59180.55780.52490.49320.46280.43370.4060
20.90040.87950.85710.83350.80880.78340.75720.73060.70370.6767
30.97430.96620.95690.94630.93440.92120.90680.89130.87470.8571
40.99460.99230.98930.98570.98140.97630.97040.96360.95590.9473
50.99900.99850.99780.99680.99550.99400.99200.98960.98680.9834
60.99990.99970.99960.99940.99910.99870.99810.99740.99660.9955
71.00001.00000.99990.99990.99980.99970.99960.99940.99920.9989
81.00001.00001.00001.00001.00001.00000.99990.99990.99980.9998
91.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
101.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
Table 3: Cumulative Poisson Probabilities (λ = 2.1 to 3.0)
x Mean (λ)
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
00.12250.11080.10030.09070.08210.07430.06720.06080.05500.0498
10.37960.35460.33090.30840.28730.26740.24870.23110.21460.1991
20.64960.62270.59600.56970.54380.51840.49360.46950.44600.4232
30.83860.81940.79930.77870.75760.73600.71410.69190.66960.6472
40.93790.92750.91620.90410.89120.87740.86290.84770.83180.8153
50.97960.97510.97000.96430.95800.95100.94330.93490.92580.9161
60.99410.99250.99060.98840.98580.98280.97940.97560.97130.9665
70.99850.99800.99740.99670.99580.99470.99340.99190.99010.9881
80.99970.99950.99940.99910.99890.99850.99810.99760.99690.9962
90.99990.99990.99990.99980.99970.99960.99950.99930.99910.9989
101.00001.00001.00001.00000.99990.99990.99990.99980.99980.9997
Table 4: Cumulative Poisson Probabilities (λ = 3.1 to 4.0)
x Mean (λ)
3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0
00.04500.04080.03690.03340.03020.02730.02470.02240.02020.0183
10.18470.17120.15860.14680.13590.12570.11620.10740.09920.0916
20.40120.37990.35940.33970.32080.30270.28540.26890.25310.2381
30.62480.60250.58030.55840.53660.51520.49420.47350.45320.4335
40.79820.78060.76260.74420.72540.70640.68720.66780.64840.6288
50.90570.89460.88290.87050.85760.84410.83010.81560.80060.7851
60.96120.95540.94900.94210.93470.92670.91820.90910.89950.8893
70.98580.98320.98020.97690.97330.96920.96480.95990.95460.9489
80.99530.99430.99310.99170.99010.98830.98630.98400.98150.9786
90.99860.99820.99780.99730.99670.99600.99520.99420.99310.9919
100.99960.99950.99940.99920.99900.99870.99840.99810.99770.9972
Table 5: Cumulative Poisson Probabilities (λ = 4.1 to 5.0)
x Mean (λ)
4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0
00.01660.01500.01360.01230.01110.01010.00910.00820.00740.0067
10.08450.07800.07190.06630.06110.05630.05180.04770.04390.0404
20.22380.21020.19740.18510.17360.16260.15230.14250.13330.1247
30.41420.39540.37720.35940.34230.32570.30970.29420.27930.2650
40.60930.58980.57040.55120.53210.51320.49460.47630.45820.4405
50.76930.75310.73670.71990.70290.68580.66840.65100.63350.6160
60.87860.86750.85580.84360.83110.81800.80460.79080.77670.7622
70.94270.93610.92900.92140.91340.90490.89600.88670.87690.8666
80.97550.97210.96830.96420.95970.95490.94970.94420.93820.9319
90.99050.98890.98710.98510.98290.98050.97780.97490.97170.9682
100.99660.99590.99520.99430.99330.99220.99100.98960.98800.9863
110.99890.99860.99830.99800.99760.99710.99660.99600.99530.9945
120.99970.99960.99950.99930.99920.99900.99880.99860.99830.9980
Table 6: Cumulative Poisson Probabilities (λ = 5.1 to 6.0)
x Mean (λ)
5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6.0
00.00610.00550.00500.00450.00410.00370.00330.00300.00270.0025
10.03720.03420.03140.02890.02660.02440.02240.02060.01890.0174
20.11650.10880.10160.09480.08840.08240.07680.07150.06660.0620
30.25130.23810.22540.21330.20170.19060.18000.17000.16040.1512
40.42310.40610.38950.37330.35750.34220.32720.31270.29870.2851
50.59840.58090.56350.54610.52890.51190.49500.47830.46190.4457
60.74740.73240.71710.70170.68600.67030.65440.63840.62240.6063
70.85600.84490.83350.82170.80950.79700.78410.77100.75760.7440
80.92520.91810.91060.90270.89440.88570.87660.86720.85740.8472
90.96440.96030.95590.95120.94620.94090.93520.92920.92280.9161
100.98440.98230.98000.97750.97470.97180.96860.96510.96140.9574
110.99370.99270.99160.99040.98900.98750.98590.98410.98210.9799
120.99760.99720.99670.99620.99550.99490.99410.99320.99220.9912
130.99920.99900.99880.99860.99830.99800.99770.99730.99690.9964
140.99970.99970.99960.99950.99940.99930.99910.99900.99880.9986
150.99990.99990.99990.99980.99980.99980.99970.99960.99960.9995
Table 7: Cumulative Poisson Probabilities (λ = 6.1 to 7.0)
x Mean (λ)
6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 7.0
00.00220.00200.00180.00170.00150.00140.00120.00110.00100.0009
10.01590.01460.01340.01230.01130.01030.00950.00870.00800.0073
20.05770.05360.04980.04630.04300.04000.03710.03440.03200.0296
30.14250.13420.12640.11890.11180.10520.09880.09280.08710.0818
40.27190.25920.24690.23510.22370.21270.20220.19200.18230.1730
50.42980.41410.39880.38370.36900.35470.34060.32700.31370.3007
60.59020.57420.55820.54230.52650.51080.49530.47990.46470.4497
70.73010.71600.70170.68730.67280.65810.64330.62850.61360.5987
80.83670.82590.81480.80330.79160.77960.76730.75480.74200.7291
90.90900.90160.89390.88580.87740.86860.85960.85020.84050.8305
100.95310.94860.94370.93860.93320.92740.92140.91510.90840.9015
110.97760.97500.97230.96930.96610.96270.95910.95520.95100.9467
120.99000.98870.98730.98570.98400.98210.98010.97790.97550.9730
130.99580.99520.99450.99370.99290.99200.99090.98980.98850.9872
140.99840.99810.99780.99740.99700.99660.99610.99560.99500.9943
150.99940.99930.99920.99900.99880.99860.99840.99820.99790.9976
160.99980.99970.99970.99960.99960.99950.99940.99930.99920.9990
170.99990.99990.99990.99990.99980.99980.99980.99970.99970.9996
Table 8: Cumulative Poisson Probabilities (λ = 7.1 to 8.0)
x Mean (λ)
7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8.0
00.00080.00070.00070.00060.00060.00050.00050.00040.00040.0003
10.00670.00610.00560.00510.00470.00430.00390.00360.00330.0030
20.02750.02550.02360.02190.02030.01880.01740.01610.01490.0138
30.07670.07190.06740.06320.05910.05540.05180.04850.04530.0424
40.16410.15550.14730.13950.13210.12490.11810.11170.10550.0996
50.28810.27590.26400.25260.24140.23070.22030.21030.20060.1912
60.43490.42040.40600.39200.37820.36460.35140.33840.32570.3134
70.58380.56890.55410.53930.52460.51000.49560.48120.46700.4530
80.71600.70270.68920.67570.66200.64820.63430.62040.60650.5925
90.82020.80960.79880.78770.77640.76490.75310.74110.72900.7166
100.89420.88670.87880.87070.86220.85350.84450.83520.82570.8159
110.94200.93710.93190.92650.92080.91480.90850.90200.89520.8881
120.97030.96730.96420.96090.95730.95360.94960.94540.94090.9362
130.98570.98410.98240.98050.97840.97620.97390.97140.96870.9658
140.99350.99270.99180.99080.98970.98860.98730.98590.98440.9827
150.99720.99690.99640.99590.99540.99480.99410.99340.99260.9918
160.99890.99870.99850.99830.99800.99780.99740.99710.99670.9963
170.99960.99950.99940.99930.99920.99910.99890.99880.99860.9984
180.99980.99980.99980.99970.99970.99960.99960.99950.99940.9993
190.99990.99990.99990.99990.99990.99990.99980.99980.99980.9997
201.00001.00001.00001.00001.00001.00000.99990.99990.99990.9999
Table 9: Cumulative Poisson Probabilities (λ = 8.1 to 9.0)
x Mean (λ)
8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8.9 9.0
00.00030.00030.00020.00020.00020.00020.00020.00020.00010.0001
10.00280.00250.00230.00210.00190.00180.00160.00150.00140.0012
20.01270.01180.01090.01000.00930.00860.00790.00730.00680.0062
30.03960.03700.03460.03230.03010.02810.02620.02440.02280.0212
40.09400.08870.08370.07890.07440.07010.06600.06210.05840.0550
50.18220.17360.16530.15730.14960.14220.13520.12840.12190.1157
60.30130.28960.27810.26700.25620.24570.23550.22560.21600.2068
70.43910.42540.41190.39870.38560.37280.36020.34780.33570.3239
80.57860.56470.55070.53690.52310.50940.49580.48230.46890.4557
90.70410.69150.67880.66590.65300.64000.62690.61370.60060.5874
100.80580.79550.78500.77430.76340.75220.74090.72940.71780.7060
110.88070.87310.86520.85710.84870.84000.83110.82200.81260.8030
120.93130.92610.92070.91500.90910.90290.89650.88980.88290.8758
130.96280.95950.95610.95240.94860.94450.94030.93580.93110.9261
140.98100.97910.97710.97490.97260.97010.96750.96470.96170.9585
150.99080.98980.98870.98750.98620.98480.98320.98160.97980.9780
160.99580.99530.99470.99410.99340.99260.99180.99090.98990.9889
170.99820.99790.99770.99730.99700.99660.99620.99570.99520.9947
180.99920.99910.99900.99890.99870.99850.99830.99810.99780.9976
190.99970.99970.99960.99950.99950.99940.99930.99920.99910.9989
200.99990.99990.99980.99980.99980.99980.99970.99970.99960.9996
211.00001.00000.99990.99990.99990.99990.99990.99990.99980.9998
221.00001.00001.00001.00001.00001.00001.00001.00000.99990.9999
Table 10: Cumulative Poisson Probabilities (λ = 9.1 to 10.0)
x Mean (λ)
9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 10.0
00.00010.00010.00010.00010.00010.00010.00010.00010.00010.0000
10.00110.00100.00090.00090.00080.00070.00070.00060.00050.0005
20.00580.00530.00490.00450.00420.00380.00350.00330.00300.0028
30.01980.01840.01720.01600.01490.01380.01290.01200.01110.0103
40.05170.04860.04560.04290.04030.03780.03550.03330.03120.0293
50.10980.10410.09860.09350.08850.08380.07930.07500.07100.0671
60.19780.18920.18080.17270.16490.15740.15020.14330.13660.1301
70.31230.30100.29000.27920.26870.25840.24850.23880.22940.2202
80.44260.42960.41680.40420.39180.37960.36760.35580.34420.3328
90.57420.56110.54790.53490.52180.50890.49600.48320.47050.4579
100.69410.68200.66990.65760.64530.63290.62050.60800.59550.5830
110.79320.78320.77300.76260.75200.74120.73030.71930.70810.6968
120.86840.86070.85290.84480.83640.82790.81910.81010.80090.7916
130.92100.91560.91000.90420.89810.89190.88530.87860.87160.8645
140.95520.95170.94800.94410.94000.93570.93120.92650.92160.9165
150.97600.97380.97150.96910.96650.96380.96090.95790.95460.9513
160.98780.98650.98520.98380.98230.98060.97890.97700.97510.9730
170.99410.99340.99270.99190.99110.99020.98920.98810.98700.9857
180.99730.99690.99660.99620.99570.99520.99470.99410.99350.9928
190.99880.99860.99850.99830.99800.99780.99750.99720.99690.9965
200.99950.99940.99930.99920.99910.99900.99890.99870.99860.9984
210.99980.99980.99970.99970.99960.99960.99950.99950.99940.9993
220.99990.99990.99990.99990.99990.99980.99980.99980.99970.9997
231.00001.00001.00001.00000.99990.99990.99990.99990.99990.9999
241.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
251.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
Table 11: Cumulative Poisson Probabilities (λ = 10.1 to 11.0)
x Mean (λ)
10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 11.0
00.00000.00000.00000.00000.00000.00000.00000.00000.00000.0000
10.00050.00040.00040.00030.00030.00030.00030.00020.00020.0002
20.00260.00230.00220.00200.00180.00170.00160.00140.00130.0012
30.00960.00890.00830.00770.00710.00660.00620.00570.00530.0049
40.02740.02570.02410.02250.02110.01970.01850.01730.01620.0151
50.06340.05990.05660.05340.05040.04750.04480.04230.03980.0375
60.12400.11800.11230.10690.10160.09660.09180.08720.08280.0786
70.21130.20270.19440.18630.17850.17100.16360.15660.14980.1432
80.32170.31080.30010.28960.27940.26940.25970.25020.24100.2320
90.44550.43320.42100.40900.39710.38540.37390.36260.35150.3405
100.57050.55800.54560.53310.52070.50840.49610.48400.47190.4599
110.68530.67380.66220.65050.63870.62690.61500.60310.59120.5793
120.78200.77220.76230.75220.74200.73160.72100.71040.69960.6887
130.85710.84940.84160.83360.82530.81690.80830.79950.79050.7813
140.91120.90570.90000.89400.88790.88150.87500.86820.86120.8540
150.94770.94400.94000.93590.93170.92720.92250.91770.91260.9074
160.97070.96840.96580.96320.96040.95740.95430.95110.94770.9441
170.98440.98300.98150.97990.97810.97630.97440.97230.97010.9678
180.99210.99130.99040.98950.98850.98740.98630.98500.98370.9823
190.99620.99570.99530.99480.99420.99360.99300.99230.99150.9907
200.99820.99800.99780.99750.99720.99690.99660.99620.99580.9953
210.99920.99910.99900.99890.99870.99860.99840.99820.99800.9977
220.99970.99960.99960.99950.99940.99940.99930.99920.99910.9990
230.99990.99980.99980.99980.99980.99970.99970.99960.99960.9995
240.99990.99990.99990.99990.99990.99990.99990.99980.99980.9998
251.00001.00001.00001.00001.00001.00000.99990.99990.99990.9999
261.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000
271.00001.00001.00001.00001.00001.00001.00001.00001.00001.0000

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