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The following less than cumulative frequency distribution shows the ages of 80 patients admitted in the city hospital during monsoon due to dengue.
\begin{tabular}{|c|c|c|c|c|c|c|}
\hline \( \begin{array}{c}\text { Age } \\
\text { (in year) }\end{array} \) & \( \begin{array}{c}\text { Below } \\
15\end{array} \) & \( \begin{array}{c}\text { Below } \\
25\end{array} \) & \( \begin{array}{c}\text { Below } \\
35\end{array} \) & \( \begin{array}{c}\text { Below } \\
45\end{array} \) & \( \begin{array}{c}\text { Below } \\
55\end{array} \) & \( \begin{array}{c}\text { Below } \\
65\end{array} \) \\
\hline \( \begin{array}{c}\text { No. of } \\
\text { patients }\end{array} \) & 6 & 17 & 38 & 61 & 75 & 80 \\
\hline
\end{tabular}
Based on the above information, answer the following questions :
The median class interval is:
a. \( 45-55 \)
b. \( 35-45 \)
c. \( 25-35 \)
d. \( 15-25 \)
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