If the mean of the following frequency distribution
\( \mathrm{P} \...
If the mean of the following frequency distribution
\( \mathrm{P} \) is 5 , then \( b= \)
W
\begin{tabular}{|c|c|c|c|c|}
\hline\( x_{1}: \) & 3 & 5 & 7 & 4 \\
\hline\( f_{i}: \) & 2 & \( a \) & 5 & \( b \) \\
\hline
\end{tabular}
(1) 10
(2) 6
(3) 8
(4) None of these
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