Leo: Premise: "A young lady wearing a pink shirt is one the back of a black white and gray jumping horse."
Hypothesis: "The woman is practicing for the horse jumping competition at her local 4-h county fair next week."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
Not all women the are jumping a horse are practicing for a horse jumping competition.
Thus, the answer is it is not possible to tell.