Member Average Age

harpazo

Pure Mathematics
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At a local yoga studio, 80% of the members are women and 20% of the members are men. The average age of the women is 30 and the average age of the men is 40. What is the average age of all the members?

Let A = average age of all members

A = (0.80)(30) + (0.20)(40)

Correct?
 

MarkFL

La Villa Strangiato
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St. Augustine
What you want is a weighted average here:

\(\displaystyle \overline{A}=\frac{.8N(30)+.2N(40)}{N}=.8(30)+.2(40)\quad\checkmark\)

Yes, your result is correct. :)
 
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harpazo

Pure Mathematics
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Mar 20, 2018
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Good to know I got it right.
 

MarkFL

La Villa Strangiato
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Curious to know the average age of all the forum members, is that possible at all for you admins to find out? If its too much a hassle, Ill just guess and say...34.

Its 34, isnt it. Booyah
It might be possible with custom coding and assuming everyone puts their real date of birth on their profiles. Not worth the effort though.
 
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