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A fact from HKT48 appeared on Wikipedia's Main Page in the Did you know column on 18 November 2011 (check views). The text of the entry was as follows:
Did you know... that two of the members of Japanese idol group HKT48 are in elementary school?
What type of flawed maths produces an average age of 13.8 years on the basis of those dates of birth? Kevin McE (talk) 09:39, 6 November 2011 (UTC)[reply]
It would appear that it is calculated by treating each member's age as the integer value in years of their age. By this calculation, the average age increases by occasional leaps, rather than by one day per day. The average calculated by this flawed method will typically underrepresent the true average age by 6 months. The average age of a pair of children, one born 8 November 2000 and one born 8 November 2001 is not 9.5 years, as the method here would suggest. Both of them are more than 9.5 years old, so that cannot possibly be. One is very nearly 10, the other is very nearly 11: the average is just short of 10.5. Any source that is so mathematically incompetent, or so motivated by desire to return an exaggeratedly low age, as to report this as a calculation of average age can scarcely be regarded as a RS in this regard. Kevin McE (talk) 20:50, 6 November 2011 (UTC)[reply]
In everyday speech, someone who's nearly 10 is still often referred to as "9", not e.g. "9.9", and someone who is nearly 11 is still often referred to as "11", not e.g. "10.9". If you want to be mathematical about it, you could say age is usually reported using a floor function. I don't see a problem with using this figure; it's a reasonable and common way to think about age. rʨanaɢ (talk) 21:33, 6 November 2011 (UTC)[reply]
For the age of one person, yes; for the average age of a group, where the result is not reported as an integer, it is highly incompetent. Kevin McE (talk) 21:47, 6 November 2011 (UTC)[reply]
Given that the DOBs are all sourced, I guess it would be fine to re-calculate the age for the DYK hook. rʨanaɢ (talk) 22:15, 6 November 2011 (UTC)[reply]
Which is what I had done: 14 years and 3 months. Kevin McE (talk) 23:49, 6 November 2011 (UTC)[reply]
Sorry for being so late, but please let me explain the information I added. This age value is not calculated by myself but by Oricon, one of the more reliable sources covering the Japanese music scene. Although I have no qualms about recalculating the average age, this will bring the article into conflict with the rest of the Japanese press reports. Will this cause any problem?--Lionratz (talk) 06:27, 7 November 2011 (UTC)[reply]
They might be a reliable source of info for the girls' ages: their mathematical ineptitude makes them unreliable for calculating an average. I am really uncomfortable about the apparent desire to exaggerate downwards the age of children presented in such a context, as well as mathematically insulted. Kevin McE (talk) 19:46, 9 November 2011 (UTC)[reply]
