Measurements of the diameters, in centimeters, of 20 copper spheres are distributed as shown below
$\begin{array}{c|c} \text{Class boundary in cm} & \text{frequency} & \\\hline 3.35 - 3.45 & 3\\ 3.45 - 3.55 & 6\\ 3.55 - 3.65 & 7\\ 3.65 - 3.75 & 4\end{array}$
What is the mean diameter of the copper spheres?

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