Find the harmonic mean of the following distribution of data 

$\begin{array}{|cccc|}\hline \begin{array}{c}\text{ Dividend yield }\\ \text{ (percent) }\end{array}& 2-6& 6-10& 10-14\\ \text{ Number of companies }& 10& 12& 24\\ \hline\end{array}$

In a mathematics test given to $15$ students, the following marks (out of $100$) are recorded:

$41, 39, 48, 52, 46, 62, 54, 40,$$96, 52, 98, 40, 42, 52, 60$

Find the mean, median and mode of this data.

The following frequency distribution gives the monthly consumption of electricity of $68$ consumers of a locality. Find the median, mean and mode of the data and compare them.

If $x_1$ and $x_2$ are the means of two groups having $n_1$ and $n_2$ observations.

Statement I : The two distributions such that ${\overline{x}}_1$ < ${\overline{x}}_2$ and $\overline{x}$ is the mean of the combined distribution, then $\overline{x_2}<\overline{x}<\overline{x_1}$

Statement II : Combined mean $\overline{x}=\frac{\Sigma n_i{\overline{x}}_i}{\Sigma n_i}$

Find the mean salary of $60$ workers of a factory from the following table:

A hockey player has scored following number of goals in $9$ matches.

$5, 4, 0, 2, 2, 4, 4, 3, 3$.

Find the mean, median and mode of the data.