Hi George,
Thats a great stat to know for sure! As for your question, there really is no direct answer as to what the typical targets are that you should look to achieve. Every customer is different, and every organization is different. It really depends on the types of tickets that are the norm for your organization and how complex those are. Of course when looking at the trend of that ratio, the lower it is, the better - meaning if you have 10 open and 9 closed, thats better than having 20 open and 2 closed. SO the closer the numbers are to one another, the better your analysts are doing. But the goal depends on where you are now vs. where you want to be, and what factors which you have control over that you can work on with the team to get the ratio to improve. Identifying those factors and making them visible is what takes a lot of time to do. For your use case, open vs. closed, you have to look at the factors that contribute to the incoming volume of tickets - for example, was a new application rolled out which is causing an influx of tickets? Is it a holiday time in which volume of tickets coming in typically drops? - and factor those things in. So really you first have to define your end goals, and then look at where you are for each of those goals. Then you can look at what needs improvement, and look to work on those areas.
Hope this helps a bit,
Jon I.