Display Ads To % of Users
<p>I have a site that I want to display ads to 10% of my traffic. I am getting on average around 30,000 hits a day and want 10% of those users to see an ad from one of my advertisers.</p>

<p>What's the best way to go about implementing this?</p>

<p>I was thinking about counting the visitors in a database, and then every 10 people that visit 1 user gets an ad. Or is there a better way of going about it?</p>

<p>I'm no good with math, so I'm not sure what's the best approach.</p>
