An automobile manufacturer is concerned about a fault in the braking mechanism of a particular model. The fault​ can, on rare​ occasions, cause a catastrophe at high speed. The distribution of the number of cars per year that will experience the catastrophe is a Poisson random variable with λ = 7.5. ​(a) What is the probability that at most 5 cars per year will experience a​ catastrophe? ​(b) What is the probability that more than 1 car per year will experience a​ catastrophe?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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An automobile manufacturer is concerned about a fault in the braking mechanism of a particular model. The fault​ can, on rare​ occasions, cause a catastrophe at high speed. The distribution of the number of cars per year that will experience the catastrophe is a Poisson
random variable with λ = 7.5.


​(a) What is the probability that at most 5 cars per year will experience a​ catastrophe?
​(b) What is the probability that more than 1 car per year will experience a​ catastrophe?

6
0.6860 0.6063
7 0.8095 0.7440
8 0.8944 0.8472
9 0.9462 0.9161
0.9747 0.9574
10
T
5.5
6.0
6.5
7.0
8.0
0 0.0041
0.0025 0.0015
0.0009
0.0006 0.0003
2
0.0062
1 0.0266 0.0174 0.0113 0.0073 0.0047 0.0030
0.0884 0.0620 0.0430 0.0296 0.0203 0.0138 0.0093
0.2017 0.1512 0.1118 0.0818 0.0591 0.0424 0.0301
0.2851 0.2237 0.1730 0.1321 0.0996 0.0744 0.0550
0.4457 0.3690 0.3007 0.2414
3
4 0.3575
0.0212
5
0.5289
0.1912
0.1496
0.1157
16 0.9999 0.9998
0.9999
1.0000
17
1.0000
18
19
20
11
0.9890 0.9799 0.9661
12
0.9955 0.9912
0.9840
13
0.9983 0.9964
0.9929
14 0.9994 0.9986 0.9970
15
0.9998 0.9995
0.9988
21
22
23
24
P
Poisson Probability Sums p(x;p)
5.5
6.0
0.4497 0.3782
0.5265
0.6728
0.7916 0.7291
0.5987
0.8774
0.8305
0.9332
0.9015
0.9467
0.9730
0.9872
0.9943
0.9976
0.9996
0.9990
0.9998 0.9996
0.9999 0.9999
1.0000 1.0000
6.5
2=0
fl
7.5
7.0
0.9208
0.9573
0.9784
0.9897
0.9954
0.2068
0.5246
0.4530
0.3856 0.3239
0.6620
0.5925
0.5231 0.4557
0.7764 0.7166 0.6530 0.5874
0.8622
0.8159
0.7634 0.7060
8.5
9.0
0.0002
0.0001
0.0019 0.0012
0.3134 0.2562
7.5
8.0
0.8881
0.9362 0.9091 0.8758
0.9658 0.9486 0.9261
0.9827 0.9726 0.9585
0.9400
0.9918 0.9862 0.9780 0.9665
0.8487 0.8030 0.7520
0.8364
0.8981
0.9947
0.9980 0.9963 0.9934 0.9889
0.9992 0.9984 0.9970
0.9997 0.9993
0.9999 0.9997
0.9987 0.9976
0.9957
0.9995 0.9989
0.9980
0.9999
0.9998 0.9996 0.9991
1.0000
0.9999
1.0000
9.5
0.0001
0.0008
0.0042
0.0149
0.0403
0.0885
8.5
0.1649
0.2687
0.3918
0.5218
0.6453
0.9998
0.9999
1.0000
9.0
0.9823
0.9911
0.9996
0.9999
0.9999
1.0000
9.5
Transcribed Image Text:6 0.6860 0.6063 7 0.8095 0.7440 8 0.8944 0.8472 9 0.9462 0.9161 0.9747 0.9574 10 T 5.5 6.0 6.5 7.0 8.0 0 0.0041 0.0025 0.0015 0.0009 0.0006 0.0003 2 0.0062 1 0.0266 0.0174 0.0113 0.0073 0.0047 0.0030 0.0884 0.0620 0.0430 0.0296 0.0203 0.0138 0.0093 0.2017 0.1512 0.1118 0.0818 0.0591 0.0424 0.0301 0.2851 0.2237 0.1730 0.1321 0.0996 0.0744 0.0550 0.4457 0.3690 0.3007 0.2414 3 4 0.3575 0.0212 5 0.5289 0.1912 0.1496 0.1157 16 0.9999 0.9998 0.9999 1.0000 17 1.0000 18 19 20 11 0.9890 0.9799 0.9661 12 0.9955 0.9912 0.9840 13 0.9983 0.9964 0.9929 14 0.9994 0.9986 0.9970 15 0.9998 0.9995 0.9988 21 22 23 24 P Poisson Probability Sums p(x;p) 5.5 6.0 0.4497 0.3782 0.5265 0.6728 0.7916 0.7291 0.5987 0.8774 0.8305 0.9332 0.9015 0.9467 0.9730 0.9872 0.9943 0.9976 0.9996 0.9990 0.9998 0.9996 0.9999 0.9999 1.0000 1.0000 6.5 2=0 fl 7.5 7.0 0.9208 0.9573 0.9784 0.9897 0.9954 0.2068 0.5246 0.4530 0.3856 0.3239 0.6620 0.5925 0.5231 0.4557 0.7764 0.7166 0.6530 0.5874 0.8622 0.8159 0.7634 0.7060 8.5 9.0 0.0002 0.0001 0.0019 0.0012 0.3134 0.2562 7.5 8.0 0.8881 0.9362 0.9091 0.8758 0.9658 0.9486 0.9261 0.9827 0.9726 0.9585 0.9400 0.9918 0.9862 0.9780 0.9665 0.8487 0.8030 0.7520 0.8364 0.8981 0.9947 0.9980 0.9963 0.9934 0.9889 0.9992 0.9984 0.9970 0.9997 0.9993 0.9999 0.9997 0.9987 0.9976 0.9957 0.9995 0.9989 0.9980 0.9999 0.9998 0.9996 0.9991 1.0000 0.9999 1.0000 9.5 0.0001 0.0008 0.0042 0.0149 0.0403 0.0885 8.5 0.1649 0.2687 0.3918 0.5218 0.6453 0.9998 0.9999 1.0000 9.0 0.9823 0.9911 0.9996 0.9999 0.9999 1.0000 9.5
T
T
0.1
0.2
0.3
0.4
0.6
0.7
0.8
0 0.9048 0.8187
0.7408
0.6065 0.5488
0.4966 0.4493
1
0.9953
0.9825
0.9631
0.8442
0.8088
2
0.9526
0.9371
3
0.6703
0.9384 0.9098 0.8781
0.9989 0.9964 0.9921 0.9856 0.9769 0.9659
0.9999 0.9997 0.9992 0.9982 0.9966 0.9942 0.9909
1.0000 1.0000 0.9999 0.9998 0.9996 0.9992 0.9986 0.9977
1.0000 1.0000 1.0000 0.9999 0.9998 0.9997
0.9865
4
5
6
1.0000
1.0000
1.0000
0.7
0.8
0.9
67890 128
4 0.9963
5
10
11
T
1.0
1.5
0
0.3679
0.2231
1
0.7358
0.5578
2
0.9197
0.8088
3 0.9810 0.9344
13
14
0.9998
1.0000
15
16
0.1
T
Poisson Probability Sums Σ p(x;μ)
2=0
0.2
1.0
0.9814 0.9473
0.9955
0.9834
0.9994
0.9999 0.9991
1.0000 0.9998
1.0000
0.3
1.5
2.0
0.1353
0.4060
0.6767
0.8571
0.4
2.0
"
0.5
0.9955
0.9858
0.9989 0.9958
0.9998 0.9989
1.0000
0.5
"
2.5
fl
3.0
2.5
0.0821
0.0498
0.2873
0.1991
0.5438
0.4232
0.7576 0.6472
0.8912 0.8153
0.9580 0.9161 0.8576
3.5
4.0
4.5
5.0
0.0302 0.0183 0.0111 0.0067
0.1359 0.0916
0.0404
0.0611
0.3208 0.2381 0.1736
0.1247
0.5366 0.4335 0.3423
0.2650
0.7254 0.6288 0.5321
0.7851
0.9347 0.8893 0.8311
0.7029
0.9489 0.9134
0.9733
0.9901 0.9786 0.9597
0.9665
0.9881
0.9962
0.9997 0.9989 0.9967
0.9999 0.9997 0.9990
0.9997 0.9991 0.9976
0.9919 0.9829
0.9972 0.9933
1.0000
0.9999
1.0000
0.6
0.9999
1.0000
3.0
"
3.5
0.9
0.4066
0.7725
4.0
4.5
0.4405
0.6160
0.9945
0.9997 0.9992 0.9980
0.9999 0.9997
0.9993
1.0000 0.9999
0.9998
1.0000
0.9999
1.0000
5.0
0.7622
0.8666
0.9319
0.9682
0.9863
Transcribed Image Text:T T 0.1 0.2 0.3 0.4 0.6 0.7 0.8 0 0.9048 0.8187 0.7408 0.6065 0.5488 0.4966 0.4493 1 0.9953 0.9825 0.9631 0.8442 0.8088 2 0.9526 0.9371 3 0.6703 0.9384 0.9098 0.8781 0.9989 0.9964 0.9921 0.9856 0.9769 0.9659 0.9999 0.9997 0.9992 0.9982 0.9966 0.9942 0.9909 1.0000 1.0000 0.9999 0.9998 0.9996 0.9992 0.9986 0.9977 1.0000 1.0000 1.0000 0.9999 0.9998 0.9997 0.9865 4 5 6 1.0000 1.0000 1.0000 0.7 0.8 0.9 67890 128 4 0.9963 5 10 11 T 1.0 1.5 0 0.3679 0.2231 1 0.7358 0.5578 2 0.9197 0.8088 3 0.9810 0.9344 13 14 0.9998 1.0000 15 16 0.1 T Poisson Probability Sums Σ p(x;μ) 2=0 0.2 1.0 0.9814 0.9473 0.9955 0.9834 0.9994 0.9999 0.9991 1.0000 0.9998 1.0000 0.3 1.5 2.0 0.1353 0.4060 0.6767 0.8571 0.4 2.0 " 0.5 0.9955 0.9858 0.9989 0.9958 0.9998 0.9989 1.0000 0.5 " 2.5 fl 3.0 2.5 0.0821 0.0498 0.2873 0.1991 0.5438 0.4232 0.7576 0.6472 0.8912 0.8153 0.9580 0.9161 0.8576 3.5 4.0 4.5 5.0 0.0302 0.0183 0.0111 0.0067 0.1359 0.0916 0.0404 0.0611 0.3208 0.2381 0.1736 0.1247 0.5366 0.4335 0.3423 0.2650 0.7254 0.6288 0.5321 0.7851 0.9347 0.8893 0.8311 0.7029 0.9489 0.9134 0.9733 0.9901 0.9786 0.9597 0.9665 0.9881 0.9962 0.9997 0.9989 0.9967 0.9999 0.9997 0.9990 0.9997 0.9991 0.9976 0.9919 0.9829 0.9972 0.9933 1.0000 0.9999 1.0000 0.6 0.9999 1.0000 3.0 " 3.5 0.9 0.4066 0.7725 4.0 4.5 0.4405 0.6160 0.9945 0.9997 0.9992 0.9980 0.9999 0.9997 0.9993 1.0000 0.9999 0.9998 1.0000 0.9999 1.0000 5.0 0.7622 0.8666 0.9319 0.9682 0.9863
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