A computer intrusion detection system (IDS) is designed to provide an alarm when

Question

A computer intrusion detection system (IDS) is designed to provide an alarm whenever an intrusion is being attempted into a computer system. Consider a double IDS with system A and system B. If there is an intruder, system A sounds an alarm with probability 0.9. and system B sounds an alarm with probability 0.91. If there is no intruder, the probability (hat system A sounds an alarm (i.e., a false alarm) is 0.21 and the probability that system B sounds an alarm is 0.1. (Let "A" be the event that alarm A sounds, "B" be the event that alarm B sounds, and "In" be the event of an intruder.) Complete parts a through d. Using the symbols given in the problem statement, express the four probabilities given in the

Explanation / Answer

a)

Pa = 0.9

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