Exercise $2$

$MF=\frac{1}{}=1000$ days $=>={10}^{-3}$ day ${?}^{(}()()-1).$

The mean time $to$ failure $of$ a component $of$ a safety system $is1000$ days. Testing

the component requires $6$ hours, whereas the time $to$ repair $is$ negligible.

Please compute the average unavailability $of$ the component, assuming that the

time interval $between$ the end $of$ the previous test and the beginning $of$ the next

one $is50$ days.

$=50$ days.