Harmonic mean of $$$15$$$, $$$23$$$

Find the harmonic mean of $$$15$$$, $$$23$$$.

The harmonic mean of data is given by the formula $$$H = \frac{n}{\sum_{i=1}^{n} \frac{1}{x_{i}}}$$$, where $$$n$$$ is the number of values and $$$x_i, i=\overline{1..n}$$$ are the values themselves.

Since we have $$$2$$$ points, $$$n = 2$$$.

The sum of the reciprocals of the values is $$$\frac{1}{15} + \frac{1}{23} = \frac{38}{345}$$$.

Therefore, the harmonic mean is $$$H = \frac{2}{\frac{38}{345}} = \frac{345}{19}$$$.

The harmonic mean is $$$\frac{345}{19}\approx 18.157894736842105$$$A.