The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram for the data.
$\begin{array}{l|c}
\text { Class } & \text { Frequency } \
\hline 40-49 & 1 \
50-59 & 2 \
60-69 & 5 \
70-79 & 12 \
80-89 & 7 \
90-99 & 4
\end{array}$

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The Answer of The exam grades of 31 students were used to obtain the frequency distribution below. Construct a histogram for the data.
$\begin{array}{l|c}
\text { Class } & \text { Frequency } \
\hline 40-49 & 1 \
50-59 & 2 \
60-69 & 5 \
70-79 & 12 \
80-89 & 7 \
90-99 & 4
\end{array}$

The Exam Grades of 31 Students Were Used to Obtain