Durch, on 27 January 2012 - 08:48 PM, said:
Do we have an answer yet?
Yes, the weighted average age from the poll is 38.
To repeat my workings, I used 20 as the lower bound and 50 for the upper, ignored the "don't knows" and weighted the others at the mid-range age giving 2428/64 = 37.9375.
Remarkable result.
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