Question $1$ options:

Consider a system with $4$ independent stages, each of which must function correctly in succession for the system to operate properly. In other words, stage $1$ must function correctly, then stage $2$ must function correctly, then stage $3$ must function correctly, and then stage $4$ must function correctly. If any of the stages fail to function correctly, the system fails.

The reliability at initiation $($when we attempt to use it$)$ for stage $1$ is $\mathrm{.}9773,$ stage $2$ is $\mathrm{.}8899,$ stage $3$ is $\mathrm{.}9913,$ and stage $4$ is $\mathrm{.}9884.$