In a computing environment, there are devices with varying probabilities of issuing an interrupt: Sensor Array $($SA$)$ with $0\mathrm{.}1,$ Webcam $($WC$)$ with $0\mathrm{.}2,$ Audio Interface $($AI$)$ with $0\mathrm{.}3,$ and Data Logger $($DL$)$ with $0\mathrm{.}4.$ With a daisy chain propagation delay of $1$s and software polling time of $0\mathrm{.}5$s per device, the task is to determine an optimal interrupt handling strategy and device order to minimize the average handling delay.

Task:

Recommend an interrupt handling strategy and device order to minimize delay, and calculate the average delay for your recommended configuration.

Recommended Strategy and Device Order:

Given the probabilities, placing devices with higher interrupt probabilities first minimizes the delay. Therefore, the optimal device order is DL$,$ AI$,$ WC$,$ SA$,$ based on descending probabilities of interrupt.

Questions:

Calculate the average delay for the recommended device order using the daisy chain method.