Iain Armitage in CBS’ “Young Sheldon,” which led prime-time programs for the second time in three weeks. NBC’s “Chicago Fire” was the top non-CBS program, finishing fifth, averaging 6.715 million viewers, a week after finishing first when CBS aired a rerun of “Young Sheldon,” averaging 6.993 million viewers. “American Idol” was ABC’s ratings leader for the third time in the …
