Rule 48. Number of Jurors; Verdict; Polling (Federal Rules)
(a) Number of Jurors. A jury must begin with at least 6 and no more than 12 members, and each juror must participate in the verdict unless excused under Rule 47(c).
(b) Verdict. Unless the parties stipulate otherwise, the verdict must be unanimous and must be returned by a jury of at least 6 members.