Please, show step by step. and formulas.

The Chief Information Officer (CIO) at Old Dominion University ODU- is trying to improve the universitys information network security. The CIO is trying to evaluate a new intrusion detection technology in the market for a possible replacement for the existing system. An intrusion detection system sounds an alarm each time possible malicious attack on a network is detected. The following information is provided: Event of interest, A, is an attack Evidence, B, is intrusion detection system setting off due to anomalous traffic Probability of an attack is 0.01 For the currently installed system, the probability of an alarm given that there is an attack is 0.9, while the probability of an alarm given there is no attack is 0.25. For the new technology, the probability of an alarm given that there is an attack is 0.8, while the probability of an alarm given there is no attack is 0.1. The CIO assumes that there are only two types of events: either there is, or there is no attack. The CIO is using evidence ratio, described as P(B|A) / P(B|A) as a way to compare the technologies. Please help the CIO compare the new technology with the currently installed system by answering the following questions:

What is evidence ratio for the currently installed system?

What is the evidence ratio for the new technology?

Behind the numbers: what does 'evidence ratio' represent and how can it be used to compare technologies meant to detect the early onset of a risk event or its causes?

For the new technology, what is the probability there is an attack given there was an alarm?

For the currently installed system, what is the probability there is an attack given there was an alarm?