A manufacturer monitors the performance of a new type of instrument that is installed at 20 different locations. If a total of 9 faults are recorded over a 100-day period, calculate the mean time...

A manufacturer monitors the performance of a new type of instrument that is

installed at 20 different locations. If a total of 9 faults are recorded over a 100-day

period, calculate the mean time between failures that should be specified for any