Final answer:
The exact number of hours a household must watch to be in the top of all viewing households cannot be determined without specific percentile values or a detailed data distribution. The average is 34 hours per week, and households in the top would watch more than this average.
Step-by-step explanation:
Television Viewing Statistics
To find out how many hours of television viewing a household must have to be in the top of all television viewing households, one would need to know the specific percentile that defines 'the top.' Typically, this could be the top 5% or even the top 1%.
Without the specific percentile or data distribution, one cannot provide a precise figure. However, considering that the average television viewing is 34 hours per week, the top percentile would likely watch significantly more than this average.
A deep analysis of the data distribution would be required, involving calculating the high percentiles to approach an accurate answer.
Referencing the given information that Americans watch television on average four hours per day with a standard deviation of 2, one could use statistical methods, such as a z-score calculation, to estimate what amount of daily television watching would fall into the top percentile.
Nevertheless, the exact calculation requires more detailed statistical data, which is not provided in the brief.