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Cumulative Poisson Distribution Table
Table shows cumulative probability functions of Poisson Distribution with various α. Example: to find the probability P(X ≤ 3) where X has a Poisson Distribution with α = 2, look
in row 4 and column 4 to find P(X ≤ 3)=0.8571 where X is Poisson(2).
x
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
0.5
0.6065
0.9098
0.9856
0.9982
0.9998
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1
0.3679
0.7358
0.9197
0.9810
0.9963
0.9994
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.5
0.2231
0.5578
0.8088
0.9344
0.9814
0.9955
0.9991
0.9998
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
2
0.1353
0.4060
0.6767
0.8571
0.9473
0.9834
0.9955
0.9989
0.9998
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
α
2.5
0.0821
0.2873
0.5438
0.7576
0.8912
0.9580
0.9858
0.9958
0.9989
0.9997
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1
3
0.0498
0.1991
0.4232
0.6472
0.8153
0.9161
0.9665
0.9881
0.9962
0.9989
0.9997
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
3.5
0.0302
0.1359
0.3208
0.5366
0.7254
0.8576
0.9347
0.9733
0.9901
0.9967
0.9990
0.9997
0.9999
1.0000
1.0000
1.0000
1.0000
4
0.0183
0.0916
0.2381
0.4335
0.6288
0.7851
0.8893
0.9489
0.9786
0.9919
0.9972
0.9991
0.9997
0.9999
1.0000
1.0000
1.0000
4.5
0.0111
0.0611
0.1736
0.3423
0.5321
0.7029
0.8311
0.9134
0.9597
0.9829
0.9933
0.9976
0.9992
0.9997
0.9999
1.0000
1.0000
5
0.0067
0.0404
0.1247
0.2650
0.4405
0.6160
0.7622
0.8666
0.9319
0.9682
0.9863
0.9945
0.9980
0.9993
0.9998
0.9999
1.0000
x
0
1
23
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
5.5
0.0041
0.0266
0.0884
0.2017
0.3575
0.5289
0.6860
0.8095
0.8944
0.9462
0.9747
0.9890
0.9955
0.9983
0.9994
0.9998
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
6
0.0025
0.0174
0.0620
0.1512
0.2851
0.4457
0.6063
0.7440
0.8472
0.9161
0.9574
0.9799
0.9912
0.9964
0.9986
0.9995
0.9998
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
6.5
0.0015
0.0113
0.0430
0.1118
0.2237
0.3690
0.5265
0.6728
0.7916
0.8774
0.9332
0.9661
0.9840
0.9929
0.9970
0.9988
0.9996
0.9998
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
7
0.0009
0.0073
0.0296
0.0818
0.1730
0.3007
0.4497
0.5987
0.7291
0.8305
0.9015
0.9467
0.9730
0.9872
0.9943
0.9976
0.9990
0.9996
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
1.0000
α
7.5
0.0006
0.0047
0.0203
0.0591
0.1321
0.2414
0.3782
0.5246
0.6620
0.7764
0.8622
0.9208
0.9573
0.9784
0.9897
0.9954
0.9980
0.9992
0.9997
0.9999
1.0000
1.0000
1.0000
1.0000
1.0000
2
8
0.0003
0.0030
0.0138
0.0424
0.0996
0.1912
0.3134
0.4530
0.5925
0.7166
0.8159
0.8881
0.9362
0.9658
0.9827
0.9918
0.9963
0.9984
0.9993
0.9997
0.9999
1.0000
1.0000
1.0000
1.0000
8.5
0.0002
0.0019
0.0093
0.0301
0.0744
0.1496
0.2562
0.3856
0.5231
0.6530
0.7634
0.8487
0.9091
0.9486
0.9726
0.9862
0.9934
0.9970
0.9987
0.9995
0.9998
0.9999
1.0000
1.0000
1.0000
9
0.0001
0.0012
0.0062
0.0212
0.0550
0.1157
0.2068
0.3239
0.4557
0.5874
0.7060
0.8030
0.8758
0.9261
0.9585
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