A typical sensor that is repairable has been tested and the following downtimes have been recorded against it. Table 1- Data for Downtime Downtime (years) 0.002 Frequency 11 0.003 0.0018 10 0.0029 0.006 7 13 5 Determine the unavailability (minimum of 4dp) of the sensor if 117 sensors were tested over a 6- month period You are required to show your workings and explain the meaning of all the terms used in your answer.