There are four (mis)quotes that spring to mind when someone bangs on about statistics.

1. He uses statistics as a drunken man uses lamp posts -- for support rather than illumination (Andrew Lang)
2. Lies, damn lies and statistics (Benjamin Disraelli).
3. The devil takes equal delight in quoting scripture and statistics. (HG Wells).
4. If your experiment needs statistics, you ought to have done a better experiment. (Edward Rutherford)

Statistics are supposed to be a tool to determine IF something has worked, not something to proove anything.

My personal feel on uptime is "was the system available when it was needed".  Why should I care that the system works between 18:00 and 06:00 when everyone using the system works 09:00 - 17:00!