Harmonic mean of $$$9$$$, $$$\frac{9}{4}$$$

The calculator will find the harmonic mean of $$$9$$$, $$$\frac{9}{4}$$$, with steps shown.

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Find the harmonic mean of $$$9$$$, $$$\frac{9}{4}$$$.


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 $$$\frac{1}{9} + \frac{1}{\frac{9}{4}} = \frac{5}{9}$$$.

Therefore, the harmonic mean is $$$H = \frac{2}{\frac{5}{9}} = \frac{18}{5}$$$.


The harmonic mean is $$$\frac{18}{5} = 3.6$$$A.