'Fifth Grader' goes to head of class Thurs.


NEW YORK -- "Are You Smarter Than a Fifth Grader?" kept up its torrid pace on a Thursday night without originals of either "Grey's Anatomy" or "CSI," powering Fox to a win in all key measures.

"Fifth Grader" averaged 20.7 million viewers and an 8.0 rating/20 share in the adults 18-49 demographic, according to preliminary estimates released Friday by Nielsen Media Research. While it wasn't the ratings that it did last week in its premiere, "Fifth Grader" remained in its second Thursday an easy victor in the 9 p.m. time slot. It retained 78% of the "American Idol" (27.4 million, 10.3/28) adults 18-49 lead-in and about the same in adults 18-34 and 76% of the "Idol" viewership.

Meanwhile, "Idol" walked to an easy victory at 8 p.m. "Survivor: Fiji" (13.7million, 4.5/12) declined in adults 18-49 from its prior average so far this season (5.2/13). Everything else on CBS was a repeat although "CSI" (15.7 million, 4.3/11) came in second to "Fifth Grader."

Everything at 10 p.m. was a repeat as well.

Nightly averages: ABC (7.1 million, 2.2/6); CBS (13.5 million, 4.0/11); NBC (5.1 million, 2.4/6); Fox (24.1 million, 9.2/24); and The CW (2.3 million, 0.9/2).