Q. Fully trained and experienced Mando vs. Average Jedi
Q. Fully trained Mando vs. Jedi Master (or an exceptional knight/plot protected jedi)
Q. Fully trained Mando vs. EU Luke Skywalker
A. the start of a bad joke
Q. Average Mando vs. Average Jedi
A. 40/60 in favor of the jedi
Edit: If you look for my thread on the Mandalorians (Controversy)
there where some good discussions about the strength of Mandos. I believe it was agreed that a team of highly experienced Mandos could take down a jedi master in some situations.