Premise: "A group of teen-agers are seated in a circle around a big skin drum."
Hypothesis: "But one is standing and talking on the cellphone."
Do we know that the hypothesis entailed by the premise? A step-by-step solution is:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A teenager isn't sitting with his friends because he mom just called.
The final answer: it is not possible to tell.