A critical production line has had dozens of stoppages over the past 12 months. Late deliveries are now a big problem. The plant manager wants you to analyze the three most common repairs and cut their completion time by 25%.
You decide to discuss this with John, a mechanical engineer who’s been at the plant a long time. You have a list of all repairs done over the past two years; it shows the quantity and completion time for each one.
John looks at the list and tell