For the following distribution, calculate mean using all suitable methods: Size of item: Frequen...

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For the following distribution, calculate mean using all suitable methods:
Size of item:
Frequency:
\( 1-4 \)
6
\[
\begin{array}{c}
4-9 \\
12
\end{array}
\]
\( \begin{array}{cc}9-16 & 16-27 \\ 26 & 20\end{array} \)
(W)
:
\( \stackrel{0.0}{\bar{a}} \)
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