A study like this would only yield meaningful results if the user selection for all three search engines were the same and randomly selected from the general internet-enabled population.
In this case, one interpretation of these results is that google users look for something very specific and thus are less likely to be satisfied with the first result that pops up, while bing users are more casual and search for generally consumable content.
>"bing users are more casual and search for generally consumable content."
That would seem to be bad for Google. Bing gets to sell ads alongside casual searches such as "cheap table lamps" and Google has to try to monetize "'Company A' 143rd Ohio Brice's Crossroads."
In this case, one interpretation of these results is that google users look for something very specific and thus are less likely to be satisfied with the first result that pops up, while bing users are more casual and search for generally consumable content.