I don’t get the point of your question, it seems a bit like asking “how long is a piece of string?“
Conversion rates for me range from 0% to 100%, even higher at times. What typically makes the greatest difference is the traffic source.
Anyone looking at a single (average) conversion rate for their website as a meaningful metric for their marketing plan is only fooling themselves. A key fundamental concept of marketing strategy is market segmentation.
Looking at average conversion rates from a group of unrelated websites is even less useful, average rates by industry niche might be a bit more useful, but only if you understand the traffic source breakdowns and specific data for each market segment.
This survey of yours smells an awful lot like a gimmick, nothing of value to participants, just a way to gather prospects for your business.