An Instructor Made a Frequency Table of the Scores His

Multiple Choice

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