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Solve GRE practice problems covering Quant (One answer choice and multiple answer choice), Data Interpretation, Text Completion, Sentence Equivalence, and Reading Comprehension Problems.
Re: What is the average (arithmetic mean) number of televisions
[#permalink]
03 Feb 2020, 07:39
1
The Average cannot be determined, since we don't know the exact number of TVs that are in the households that have 5 or more TVs (they can have 5, 6, ...or every other greater number) --> to compute the average, we need any single number (it takes outliers into account in contrast to the median). We could compute the median, but that is not asked, so the answer is A
Average = (Total Number of Houses *16% * 0 + Total Number of Houses *8% * 1 + Total Number of Houses *24% * 2 + Total Number of Houses *20% * 3 + Total Number of Houses *20% * 4 + Total Number of Houses *12% * 5 or more) / Total Number of Houses
If the last number of televisions was a fixed number instead of 5 or more then we would ahve found the average. But in this case we cannot find it.
So, Answer will be A. Hope it helps!
Watch the following video to Learn the Basics of Statistics