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The weekly observations on cost of living index in a certain city for the year \( 2004-2005 \) are given below. Compute the weekly cost of living index.
(W)
\begin{tabular}{cccc}
\hline \( \begin{array}{c}\text { Cost of living } \\
\text { Index }\end{array} \) & \( \begin{array}{c}\text { Number of } \\
\text { Students }\end{array} \) & \( \begin{array}{c}\text { Cost of living } \\
\text { Index }\end{array} \) & \( \begin{array}{c}\text { Numberof } \\
\text { Students }\end{array} \) \\
\hline \( 1400-1500 \) & 5 & \( 1700-1800 \) & 9 \\
\( 1500-1600 \) & 10 & \( 1800-1900 \) & 6 \\
\( 1600-1700 \) & 20 & \( 1900-2000 \) & 2 \\
\hline
\end{tabular}
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