Premise: Scientists hard as work in a lab.

Hypothesis: A group of scientists are performing vital experiments in their place of work
it is not possible to tell

Premise: A man in a blue shirt works on a bicycle.

Hypothesis: The man is a professional mechanic.
it is not possible to tell

Premise: A man hitchhiking with a bag on has back.

Hypothesis: Hitchhiker eating a snack
no

Premise: Woman balances a pie on her head and looks up into camera

Hypothesis: A woman is posing for the camera with a pie on her head.
yes