Jump to content

Welcome to BrainDen.com - Brain Teasers Forum

Welcome to BrainDen.com - Brain Teasers Forum. Like most online communities you must register to post in our community, but don't worry this is a simple free process. To be a part of BrainDen Forums you may create a new account or sign in if you already have an account.
As a member you could start new topics, reply to others, subscribe to topics/forums to get automatic updates, get your own profile and make new friends.

Of course, you can also enjoy our collection of amazing optical illusions and cool math games.

If you like our site, you may support us by simply clicking Google "+1" or Facebook "Like" buttons at the top.
If you have a website, we would appreciate a little link to BrainDen.

Thanks and enjoy the Den :-)
Guest Message by DevFuse

- - - - -

Averages part III

  • Please log in to reply
1 reply to this topic



    Senior Member

  • Members
  • PipPipPipPip
  • 1837 posts
  • Gender:Female

Posted 30 July 2013 - 01:07 AM

This post will possibly help with "averages part II"


given two positive real numbers a and b, there are four ways of computing the "mean":


am= arithmetic mean = (a+b)/2

gm = geometric mean = sqrt[a b]

hm = harmonic mean = 2 / (1/a + 1/b)

rms = root mean square = sqrt[(a^2+b^2)/2]


Rank these from smallest to largest proving your ranks.  If one type is not always less than another, explain when it is equal or when it is more.

Attached Images

  • prob214.gif

  • 0

#2 Rainman


    Advanced Member

  • Members
  • PipPipPip
  • 162 posts

Posted 30 July 2013 - 02:29 AM

Spoiler for

Edited by Rainman, 30 July 2013 - 02:30 AM.

  • 0

0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users