# Changes

moving my response to the end of the thread

If anyone who was editing the average pages knew anything about descriptive statistics, this page should say something a lot different.

You certainly should not be reverting such pages, because you clearly don't have sufficient mathematical understanding to appreciate the nuances.

:On the other hand... a Prius has a dashboard display that displays the average miles per gallon as a bar chart, over five-minute intervals. On a 25-minute trip, the display registers 30 mpg for the first five minutes, 35 mpg for the next five, 40 mpg for the next five, 45 mpg for the next five, 50 mpg for last five. Assuming the car is driven at a constant speed, what's the average mileage for the trip? Answer: the harmonic mean of 30, 35, 40, 45, and 50 = 38.72 mpg. I wouldn't call that practical, but it's one of the very few real-world examples I've ever come across where the right answer is the harmonic mean. (Another is the average speed of a consisting of equal ''distances'' driven at varying speeds... e.g. if I commute to work at an average speed of 70 mph and commute home at an average speed of 30 mph, what's my average speed for the day? Answer: the harmonic mean of 70 and 30. [[User:Dpbsmith|Dpbsmith]] 21:08, 14 May 2007 (EDT)

::Not sure what you meant, Sean, and anyway your decision to skip a spell check doesn't raise my confidence in you. Nor does your attempt to use my editorial decision as a launching ground for an attack on the project. What did you even come here for?

::If you're still around, read what I posted at [[talk:Median]] and what I added to [[Mean]]. I think I know more math than you: I have taught SAT prep (my math SAT, if you are familiar with US college placement tests, was 760 - that's in the 99th [[percentile]], okay?).

==some random math stuff in case anyone wants to use it==