In a factory, the time during working hours in which a machine is not operating as a result of breakage or failure is called the 'downtime'. The following distribution shows a sample of downtimes of...

Extracted text: In a factory, the time during working hours in which a machine is not operating as a result of breakage or failure is called the 'downtime'. The following distribution shows a sample of downtimes of 144 machines. Downtime 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 Frequencies 10 20 37 26 21 a. Compute the average downtime when a machine is not operating. Answer in exact fraction, or rounded to at least 4 decimal places. b. Compute the median downtime when a machine is not operating. Answer in exact fraction, or rounded to at least 4 decimal places. c. Determine the modal value of the downtime. Answer in exact fraction, or rounded to at least 4 decimal places.