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 }

Question

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

Quizplus · Accepted Answer

The midpoint of a class interval is calculated as the average of the lower and upper class limits. 
For the third class interval, the lower limit is 30 and the upper limit is 35. 
Therefore, the midpoint is (30+35)/2 = 32.5.

A Company Collected the Ages from a Random Sample of Its