Premise:
"is it is it a hundred percent or is it fifty percent"
Hypothesis: Is it one quarter, half or whole?

it is not possible to tell

Premise:
"Songs have traditionally been sung by men relating the hard life of the farmer or fisherman and including an element of sentimentality rarely expressed in other areas of a Greek male's life."
Hypothesis: Farmers and fishermen live hard lives here.

yes

Premise:
"No one would think of looking there, Poirot continued. "
Hypothesis: Poirot then said that it was the first place everyone would have thought to look.
no