An instructor made a frequency table of the scores his students got on a test
$$\begin{array} { c c }
\text { Score } & \text { Frequency } \
30 \text {-under } 40 & 1 \
40 \text {-under } 50 & 4 \
50 \text {-under } 60 & 5 \
60 \text {-under } 70 & 10 \
70 \text {-under } 80 & 20 \
80 \text {-under } 90 & 10 \
90 \text {-under } 100 & 5
\end{array}$$
The midpoint of the last class interval is _________.
A)90
B)5
C)95
D)100
E)50

Question

An instructor made a frequency table of the scores his students got on a test 
$$\begin{array} { c c } 
\text { Score } & \text { Frequency } \
30 \text {-under } 40 & 1 \
40 \text {-under } 50 & 4 \
50 \text {-under } 60 & 5 \
60 \text {-under } 70 & 10 \
70 \text {-under } 80 & 20 \
80 \text {-under } 90 & 10 \
90 \text {-under } 100 & 5
\end{array}$$
The midpoint of the last class interval is _________.
A)90
B)5
C)95
D)100
E)50

Quizplus · Accepted Answer

The midpoint of a class interval is calculated by adding the lower limit to the upper limit of the class and then dividing by 2. For the last class interval (90 - under 100), the midpoint is (90 + 100) / 2 = 95.

An Instructor Made a Frequency Table of the Scores His