Start with going in to your project

1. Click on inspections in the sidebar

2. Click on view all rounds on the inspection you want to see the statistic from
   

Here you can see reviewed items, total open deviations, total overdue deviations and the average time to resolve a deviation. (The calculation on average time to resolve deviations excludes weekends)

You can also see round statistics from earlier deviations, new deviations and positive observations reported during a particular inspection round.