Answer
There were an expected of around 128,781 inmates held who were 25 to 29 years old in 2010.
Work Step by Step
The graph shows that 17.2 percent of state and federal prison inmates are 25 to 29 years old.
Thus, if in 2010 there were 748,728 inmates under the jurisdiction of state and federal correction authorities in the United States, the number of 25 to 29 year olds is:
$=17.2\%(748,728)
\\=0.172(748,728)
\\=128,781.216
\\\approx 128,781$
