It appears that the 95% calculations (doesn't matter if you're using SQL or SWQL) will show TOP 95 Percent of the Average for all results in the query. However, these calculations do not take into account your Database Retention settings. For example, if my detailed statistics roll-up after 7 days and I want a report to show the last 30 days of 95%, my results set will have multiple values for each day within the last 7 days. But days that are older than the last 7 days, will have been summarized into hourly values. And so on and so forth depending on the retention settings. The way that the report is designed right now, it averages all values which makes the 95% skewed.