If the mean of the following table is 30 , then find (W) the missing frequencies. \( \begin{arra...

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Frequency (2001)
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If the mean of the following table is 30 , then find
(W) the missing frequencies.
\( \begin{array}{cc}\text { Class lnterval } & \text { Frecuonoy } \\ 0-15 & 10 \\ 15-30 & a \\ 30-45 & b \\ 45-60 & 8 \\ \text { Total } & 60\end{array} \)
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