figure this one out.   you have a graph with some numbers, doesn't matter what it shows.  Above the chart it says "TV RATINGS IN THE US 1980-1987)

Below the chart it says "RATINGS EQUAL THE PERCENT OF TV HOUSEHOLDS IN THE US THAT VIEWED THE SHOW"

the question askes "approximately what was the average number of TV households in the US that viewed the show from 1981 through 1985 inclusive?

either

12%

14%

15%

18%

or "it cannot be determined from the info given"

the answer is the last one because "you don't know if the number of TV viewing households changes from year to year (though it is likely that it does".  IT FUCKING  CLEARLY states that the ratings equal the percent of TV HOUSEHOLDS that viewed the show.  what more info do you need?  they didn't magically just pick a fucking % for each year that the show was being watched, they had to get the data from real numbers.  i don't get it. 

anyway, that's the only one I missed out of 20. too easy.