Is that number attached or crawling? If attached, how many have you caught before they dug in? I live in the same area and that number would be really low. Stumble on some deer ticks and you'd be lucky if you only end up with 10x that number.
9 attached, 2 crawling. I don't stumble on many deer ticks, even though my dog and I put in some 30 miles a week running through the local singletrack parks!