Premise: "A female swimmer in a black bathing suit about to jump off the racing platform into a pool."
Hypothesis: "The swimmer is studying for her math test at the library."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:
Swimming pools are not found in libraries. A person who is about to jump into a pool is generally not studying at the same time. So, the answer is no.