A Company Collected the Ages from a Random Sample of Its

Multiple Choice

A company collected the ages from a random sample of its middle managers,with the resulting frequency distribution shown below. $\begin{array} { lc } \text { Class Interval } & \text { Frequency } \\20 \text { to } < 25 & 8 \\25 \text { to } < 30 & 6 \\30 \text { to } < 35 & 5 \\35 \text { to } < 40 & 12 \\40 \text { to } < 45 & 15 \\45 \text { to } < 50 & 7\end{array}$
What is the midpoint of the third class interval?

A) 22.5
B) 27.5
C) 32.5
D) 37.5
E) 42.5