Harmonic mean of $$$21$$$, $$$29$$$

Find the harmonic mean of $$$21$$$, $$$29$$$.

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 $$$\frac{1}{21} + \frac{1}{29} = \frac{50}{609}$$$.

Therefore, the harmonic mean is $$$H = \frac{2}{\frac{50}{609}} = \frac{609}{25}$$$.

The harmonic mean is $$$\frac{609}{25} = 24.36$$$A.