At the end of act 2, the juror have decided that the accused us not guilty beyond a 'reasonable doubt'. What does this meAn? Does it mean that the accused is innocent? Explain.

No, for the jury to say that the accused is 'not guilty' beyond a reasonable doubt means that they have not received sufficient proof that he committed the crime. It does not mean that the accused is innocent, it simply means that the jury has seen enough solid proof to hand down a guilty verdict.