Questions# $4$: $(6$ points$)$

A company which designs and produces display posters for exhibitions and sales promotion events company uses is causing some problems. This is its large platform color laser printer. Currently, the mean time between failures of the printer is $70$ days $($This platform is operated only $8$ hours a day$)$ and its mean time to repair is $48$ hours.

The company has discussed its problem with the supplier of the printer who has offered two alternative service deals:

One option would be to buy some preventive which would be carried out cach weekend. This would raise the MTBF of the printer to $140$ days.

The other option would be to subscribe to a faster repair service which would reduce the MTTR to $32$ hours.

A$)$ Calculate the system steady$-$state availability for cach options?

B$)$ Give a conclusion for which of the Supplier service options will you use? Why?