Find the value of \( p \), if the mean of the following distribution is 18 : \begin{tabular}{|l|...

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Find the value of \( p \), if the mean of the following distribution is 18 :
\begin{tabular}{|l|c|c|c|c|c|c|}
\hline Variate \( \left(x_{i}\right) \) & 13 & 15 & 17 & 19 & \( 20+p \) & 23 \\
\hline Frequency \( \left(f_{i}\right) \) & 8 & 2 & 3 & 4 & \( 5 p \) & 6 \\
\hline
\end{tabular}
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