Is the ''Only a minority of Muslims are radical'' true?

[TheMessiah]

The poverty part has been disproven. It's been consistently shown that the middle and upper classes in Islamic countries are more likely to be radical in their belief.

Source please.

The people most likely to sympathize and join extremist causes belong to the middle class and have at least a primary school education. Most terrorist groups (Islamic) are funded by powerful people.

Economic/social class section.

http://wikiislam.net/wiki/Muslim_Statistics_-_Terrorism

Majority of Islamic terrorist is sourced through and powered by well-educated people.

Particularly, this was from the Rand Corporation report on counter-terrorism:

''Terrorists are not particularly impoverished, uneducated, or afflicted by mental disease. Demographically, their most important characteristic is normalcy (within their environment). Terrorist leaders actually tend to come from relatively privileged backgrounds. These conclusions are firmly supported by empirical analysis''