Arithmetic mean: grouped data
103,875
75,000
20,860
$75,000+
62,500
19,272
$50,000-74,999
42,500
16,660
$35,000-49,999
30,000
13,698
$25,000-34,999
20,000
14,587
$15,000-24,999
12,500
8,093
$10,000-14,999
5,000
10,705
< $10,000
Midpoint
f
Household $
Money Income of Households, 1998 (in 1,000’s)
Source:  U.S. Census Bureau, Statistical Abstract of the U.S., 2000, Table 738.