Premise: "In this picture we have about 11 girls posing for a picture in a pool."
Hypothesis: "The 11 girls are posing for a school swim team picture."
Do we know that the hypothesis entailed by the premise? Now, let's be accurate as possible. Some thinking first:
Girls posing for a picture in a pool does not imply the photo is for a school swim team picture. So, the answer is it is not possible to tell.