What's weird is all your apache requests are pretty much "sending reply"
Normally, you have a big mix of "Reading Request",. Closing Connection, Waiting for Connection, and just a few sending replies.
Yours are all sending reply.
Here's an output from one of my servers that is handling ~60 requests/sec to your 7 requests/sec.
Code:
Parent Server Generation: 0
Server uptime: 1 day 21 hours 51 minutes 46 seconds
Total accesses: 9393716 - Total Traffic: 5.1 GB
CPU Usage: u1865.79 s183.61 cu3.53 cs0 - 1.24% CPU load
56.9 requests/sec - 32.2 kB/second - 579 B/request
16 requests currently being processed, 25 idle workers
R__C__CC______C_W__WR____CC...CC....CC.C_.....C__.__.._._.......
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You can see the # requests currently being processed on yours is gradually increasing over time, which means something is blocking apache, and like mentioned it could be a fucked up rewrite rule that is looping or something.
In any case all the sending replies is not normal