Putting aside human messiness, consider a situation where each juror is like an independent coin flip. Since this is a criminal case, unanimity is required.

If the chance each juror votes for conviction is 99%,  the chance of conviction  is 0.99¹² • 100%=  89%.

If the chance each juror votes for conviction is 95%,  the chance of conviction  is 54%.

If the chance each juror votes for conviction is 90%,  the chance of conviction  is 28%.

If the chance each juror votes for conviction is 85%,  the chance of conviction  is 14%.

This is why the court of public opinion is a mediocre predictor of jury verdicts.