Answer
There were around 118,299 inmates in 2010 who were 35 to 39 years old.
Work Step by Step
The graph shows that 15.8 percent of state and federal prison inmates are 35 to 39 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 35 to 39 years old is:
$=15.8\%(748,728)
\\=0.158(748,728)
\\=118,299.024
\\\approx 118,299$
