引用:
原帖由 chefung 於 2009-4-3 05:03 PM 發表 standard deviationit kind of measures how disperse a statistical population is ( how widely it spread, or you can say )
oh, right. learn something new.
durex put out a research 2 years ago, the stats is divided by nation. (i thought we have this conversation before) :p
for hong kong people, the average is about 5.x-6 inches... (erected size, of course)
for american is about 8 inches...
japanese/indians about 4.x-5...