According to Uncle John’s Bathroom Reader tear-a-page-a-day calendar the average person farts 14 times a day. That is one fart about every one hour and forty minutes for a 24 hour day. However, if one usually doesn’t fart during his sleeping hours then we can say that is 14 farts for every 16 hours, or one blast for about every one hour and six and half minutes, on the average of course.
Of course some people hardly let one slip at all - except the "silent but deadly" type that you can't really pin-point who did it and then there are others, especially after dining at a Mexican Restaurant, might "Let it rip" more frequently, and loudly, that might sound like moving furniture.
Keep that is mind the next time you pull somebody’s finger.