U.S. households have become smaller over the years. The following table from the 2010 GSS contains information on the number of people currently aged 18 years or older living in a respondent's household. Calculate the mean number of people living in a U.S. household in 2010.
Household Size Frequency
1 ............................... 381
2 ............................... 526
3 ............................... 227
4 ............................... 200
5 ............................... 96
6 ............................... 42
7 ............................... 19
8 ............................... 5
9 ............................... 2
10 ............................... 2
Total ...........................1,500