1 votes 1 votes sm asked Jan 7, 2018 sm 216 views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply gauravkc commented Jan 7, 2018 reply Follow Share This is in Network security not operating systems. Intrusion-detection systems are there in gate syllabus? 0 votes 0 votes Shubhanshu commented Jan 7, 2018 reply Follow Share I think it is from Bayes theorem. 0 votes 0 votes gauravkc commented Jan 7, 2018 reply Follow Share yes. The probability of occurrence of intrusive records is 10 ∗ 20/106 = 0.0002. Using Bayes’ theorem, the probability that an alarm corresponds to a real intrusion is simply 0.0002 ∗ 0.6/(0.0002 ∗ 0.6 + 0.9998 ∗ 0.0005) = 0.193 http://web.cs.du.edu/~dconnors/courses/comp3361/assignments/ch15.pdf 0 votes 0 votes Please log in or register to add a comment.