I'd like to know II

Just received a call from a marketing company asking how many adults in this household are using 3G phones.

What kind of a stupid survey is that? Given that there aren't that many 3G providers in action, surely they must already know? In contrast to say how many terrorists there are in the population?

Anyhow, if I were to conduct some pointless surveys these are what I'm aching to find out:

* The proportion of HK people wearing weed-themed t-shirts who are practising potheads.
* The proportion of hooker-looking women who are actually hookers.
* The proportion of MTR/KCR users and mall rats who noticed that there's at least 10 degrees centigrade difference in temperature between the trains/malls and the outside world.
* The proportion of KCR passengers who actually went to the "quiet car" genuinely expecting to find it quiet.