4. Examine the systems given below. Which system is more reliable, a or b? c or d? Now calculate the reliability of each system. Were your perceptions correct? 99% 90% a b. 98% 98% 98% 90% 90% 98% 98% 98% d. 90% 90% 90% 90% 90% 90% If it costs $1,200 for each 90% reliable component, $1,600 for each 93% component, $2,000 for each 95% reliable component, and $11,000 to replace a failed system, which system would you choose, a or b? c or d? 3. Aaron Lockwood is an emergency medical technician for a local rescue team and is routinely called on to render emergency care to citizens facing crisis situations. Although Aaron has received extensive training, he also relies heavily on his equipment for support. During a normal call, Aaron uses five essential pieces of equipment, whose individual reliabilities are 0.98, 0.97, 0.95, 0.96, and 0.99, respectively. a. Aaron claims his equipment has maximum probability of failure of 5%. Is he correct? b. What individual equipment reliabilities would guarantee an overall reliability of 96%