Don't know how many are normal for your area, but I generally see 10 - 20 per day, depending on where I am. Most people don't know it, but wasps are meat eaters, as are hornets (and some people call various hornets, such as yellow jackets and bald-faced hornes, wasps). I see them more frequently where food is served and where people congregate around food. This is because the food draws flies, and the flies draw the little, winged-predators. I've watched a single hornet gulp down as many as 5 flies that were about half the hornets size. They hover around, flying slowly, hunting, watching, especially around barbecues and picknic tables. When they see a fly land, they pounce on it.
Oh, and occasionally, I know of people who have been bitten, not stung, but bitten by yellow jackets.
The big-black wasps that look so dangerous, from what I'm told, pack a powerful wallop in thier sting. I've never been stung by one and so can't say one way or the other. But I've had my share, and several other people's share of yellow jacket and hornet stings, coupled with a few bumble bee stings as well. That's the price you pay for playing along streams and in the woods as a child. From the critters that have stung me, the yellow jackets are the most painful. My dad said that the bald-face hornet. a black little bugger with a white face, got him between the eyes as a teen, and knoked him off his feet with the pain. I've never been stung by one and so can't say which one is worse. Bumble bees are a cake walk compared to hornets and wasps, especially since bees can only sting once. Then they lose their stinger and die. Hornets and wasps sting again and again. I know, I have trod upon to yellow jacket nests that were built underground. I had many welts from those encounters.
As an added bit of info, if you step on a nest, especially if you squish one of the hornets, they leave a tell-tale scent on you. You can't smell it, but the other hornets can. The first time I stepped on a nest, at about age 7, they singled me out from a half dozen other boys who were with me. I was the only one who got nailed. I was the one who had the scent on my shoe.
Oh, and if you're in the Phillippines, bees don't even need a reason to come and sting you. I was with shipmates at a party that our church put on, on base. I was in a swimming pool. I heard a yelp. Someone had gotten stung on the foot. I figured he'd stepped upon a loan bee. The a swarm of the winged bandits came through and nearly all of us, including me, suffered stings. I got hit on the forearm as I lifted it out of the water while swimming. We all high-tailed it out of there, and quick.
Yep, I know something about stings and venomous insects. I've gotten my share of bites and stings, and as I said earlier, a few other peoples share as well.
Just be careful with the wasps. If you get them mad, they'll nail you multiple times. And one little more thing, it hurts much more on the finger tip than on the forearm. I know that one from personal experience too.
Seeeeeya; Goodweed of the North