Personally, I would use 'was', but I seem to remember once reading that British English favoured one and American the other, particularly in situations like 'my family is crazy' or 'my family are crazy'. Unfortunately, I can't remember which one is British and which is American. Here in Australia, we tend to follow British more than American English, suggesting that treating groups as singular nouns is British.
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richard_s I guess that means 'a group of boys was dancing' is correct.Would you say "a number of people is..." or "a number of people are..."?
innamuris'a number of people' is considered plural.By whom? A number is grammatically singular. My point was common sense should prevail over grammatical "rules". Rather than try to ascertain if something is singular or plural grammatically we should do it by feel on a case by case basis.
wingfatI guess I should have said I'm American. In the USA we'd say "my family is crazy."If you are American you don't need any rules. You already know what sounds ok, and that's what counts. If somebody told you "It is I" is correct, would you start to say it instead of "It's me", even if it sounds totally weird? No.