@ Khandro Hadn't missed it, or Jims contribution, so much as not agreed with either and so dismissed them :)
We do not know from the OP, or from the survey, exactly what was meant by those who carried out the survey, and how that meaning was conveyed to the respondents when the term "prayer" was used.
And I think there is a significant difference between say, " Oh god please let me win the lottery this week" - which I see as more as a kind of hopeful expression that probability be kind, couched in a kind of cultural context derived from all the religious gobbledegook that humans have had to assimilate over the centuries - and a genuine ,hands together, eyes closed call to action from a desperate practitioner to an almighty god to save a loved ones life, or not to let the parents find out about the bad school report, or the desire to have a replacement limb magically grafted on to where the much loved and much missed original used to be, or for that oncoming and frankly pants-wettingly terrifying onrushing tidal wave to magically recede, please, like, NOW!.
And then if you really want to determine the credibility of the survey, you have the problem of deciding whether what WT calls "10,000 atheists" is actually credible, and genuine, or not - but, that apart, if prayer is considered the former - a kind of reflex, shout out wish for probability to be kind then perhaps the quoted figure is indeed not all that surprising - all though if you ever hear me call out to god feel free to shoot me for being a hypocrite, because I never have, and I never will - But if you consider prayer to be the latter - a kind of genuine genuflective intercessory prayer - then I am very surprised indeed. Surprised to the point of disbelief in the survey actually even existing :)
And, regardless of the nature of the prayer - reflex or genuflective- epicurus' paradox still holds....