Q: "A group of woman from various ethnic backgrounds are competing in a marathon." Does this mean that "The woman are competing in a biking marathon."?
A: it is not possible to tell

Q: "A group of people on a dock by a city boarding various boats" Does this mean that "A group of people are near boats."?
A: yes

Q: "Two men on a motorcycle with buckets and canisters." Does this mean that "Two men on a motorcycle are taking buckets and canisters to the recycling bin."?
A: it is not possible to tell

Q: "A woman stands in a crowd holding a camera." Does this mean that "A woman is alone on the street."?
A:
no