What percentage of all spyware/malware in this test was not captured by A.

Show your calculations in an Excel or Google Sheets spreadsheet and upload.

Suppose that two different network firewall software applications are being tested by a new small business. Two firewalls were tested, A and B. Suppose that over one month of time, the below types of spyware/malware were passed through onto the network by these firewalls. Answer the following questions.

 

                              Key Loggers   Cookies     Hijackers     Trojan Horses

Firewall A                 4                      184                 0                                2

Firewall B                 4                       166                 2                               5

  1. What percentage of all spyware/malware in this test was not captured by A.
  2. Of the hijackers, what percentage were allowed by Firewall B.
  3. If I chose a security issue at random, what is the probability that it was either a key logger or trojan horse.
  4. If I chose a security issue at random, and given that it was not blocked by B, what is the probability that the issue not blocked by B was a cookie.

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