The Nielsen Media Research television rating measures the percentage of television owners who are watching a particular television program. The highest-rated television program in television history was the M*A*S*H Last Episode Special shown on February 28, 1983.

A 60.2 rating indicated that 60.2% of all television owners were watching this program.

Nielsen Media Research provided the list of the 50 top-rated single shows in television history (The New York Times Almanac, 2006). The following data show the television network that produced each of these 50 top-rated shows.

ABC ABC ABC NBC CBS ABC CBS ABC ABC NBC NBC NBC CBS ABC NBC CBS ABC CBS NBC ABC CBS NBC NBC CBS NBC CBS CBS CBS NBC NBC FOX CBS CBS ABC NBC ABC ABC CBS NBC NBC NBC CBS NBC CBS CBS ABC CBS ABC NBC ABC

b. Which network or networks have done the best in terms of presenting top-rated television shows? Compare the performance of ABC, CBS, and NBC.