Suppose that 20 malicious software instances are reported. Assumethatahe iciqus sources can be assurmed ta be independent. (a) What is the probability that at least one instance is "Klez? Round youranswerto four decimal places (eg. 98.7654). i (b) What is the probability that five or more instances are Klea2 Raund youranswerto four decimal places (e.g. 98.7654). (c) What is the mean of the number of "Klez" instances among the 20reported? Round your answer to twa decimal places (eg. 98.76). (d) What is thestandard deviation of the numnber of "Klez iS (e.g. 98.76). sthe 20 reported? Round your answer to two decimal places

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The absolute tolerance is +-0.001
Suppose that 20 malicious software instances arereported. Assumethatphemalicious sources can be assumed ta be independent.
la) What is the probability that at least one instance is "Klez? Round youranswerta four decimal places (eg 98.7654).
(b) What is the probability that five or more instances are Kllez? Round youranswerto four decimal places (eg. 98.7654).
(c) What is the mean of the number of "Klez instances among the 20reported Round your answer to two decimal places (e.g. 98.76).
i
(d) What is the standard deviation of the numberof "Klez instances among the 2p reparted? Round your answer ta two decinal places
(e.g. 98.76).
Transcribed Image Text:Suppose that 20 malicious software instances arereported. Assumethatphemalicious sources can be assumed ta be independent. la) What is the probability that at least one instance is "Klez? Round youranswerta four decimal places (eg 98.7654). (b) What is the probability that five or more instances are Kllez? Round youranswerto four decimal places (eg. 98.7654). (c) What is the mean of the number of "Klez instances among the 20reported Round your answer to two decimal places (e.g. 98.76). i (d) What is the standard deviation of the numberof "Klez instances among the 2p reparted? Round your answer ta two decinal places (e.g. 98.76).
An article in Information Security Technical Report ["Malicious Software-Past, Present and Future (2004. Vol. 9. pp. 6–18)] provided
the following data on the top ten malicious software instances fopr 2002. The dear leader in the number of registered incidences for the
year 2002 was the Internet worm"Klez" and it is still one of the most widespread threats. This virus was first detected on 26 October
2001, and it has held the top spot among malicious software forthe longest period in the history of virology.
Place Name
% Instances
Worm.Klez
59.76%
WormLentin
18.05%
Worm Tanatos
5.54%
4.
Worm Badtrans!!
128%
Macro Word97.Thus 150%
WormHybris
0.17%
Worm Bridex
0.90%
Worm Magistr
0.48%
Win95.CIH
0.34%
10
I-Worm Sircam
11.98%
Suppose that 20 malicious softuarainrt
Transcribed Image Text:An article in Information Security Technical Report ["Malicious Software-Past, Present and Future (2004. Vol. 9. pp. 6–18)] provided the following data on the top ten malicious software instances fopr 2002. The dear leader in the number of registered incidences for the year 2002 was the Internet worm"Klez" and it is still one of the most widespread threats. This virus was first detected on 26 October 2001, and it has held the top spot among malicious software forthe longest period in the history of virology. Place Name % Instances Worm.Klez 59.76% WormLentin 18.05% Worm Tanatos 5.54% 4. Worm Badtrans!! 128% Macro Word97.Thus 150% WormHybris 0.17% Worm Bridex 0.90% Worm Magistr 0.48% Win95.CIH 0.34% 10 I-Worm Sircam 11.98% Suppose that 20 malicious softuarainrt
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