Doubling the mean time between failures of a machine results in the same or a greater improvement as cutting the mean time to repair in half. T F Adding an extra machine in a non-bottleneck operation never helps the manufacturing system to achieve higher throughput for the same WIP level. T F If two machines have the same average natural processing times, the same standard deviation of processing times, and the same availabilities, then we can treat them as if they're identical (i.e., we would be indifferent between the two). T f