QUESTION $25$

The classroom display system has three major components. Components' reliabilities are $92,97,$ and $\mathrm{.}99.$ All components must function in order for the system to operate effectively. What will be the highest reliability the display system can achieve? $($Please keep two digits after the decimal point.$)$

QUESTION $26$ is exponential with a mean of $48$ months. What is the probability that any given unit will fail sooner than $24$ months? $($Please keep two digits after the decimal point$)$