To counter terrorism, a new portable explosive detection system is developed.

(a) Suppose that the system will be installed in an airport where only 1 out of one
million baggage may contain explosives, what is the static reliability level needed for
the system; i.e. how accurate must the system be so that the risk of passing a
positive case be kept to lower than 0.0000001%? (give your answer to the 4th
decimal place)

(b) With the answer from the above consideration, what is the false alarm rate?
Suppose that the false alarm rate must be kept to lower than 0.001 what is the static
reliability level needed for the system? (give your answer to the 10th decimal place)

(c) Suppose that the accuracy in (b) cannot be achieved in practice and re-screening is
proposed for baggage detected as carrying explosives. What is the false alarm rate
after the first re-screen? How many re-screens are needed to achieve the desired
false alarm rate?

Answer rating: 100% (QA)

a The static reliability level needed for the system is 999999 The static rel... View the full answer