Calculate the harmonic mean of $3$ and $27$ .

2.4

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3.4

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5.4

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6.4

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Solution

The correct option is C $5.4$
Harmonic mean $=$ $\frac{n}{\frac{1}{x_{1}} + \frac{1}{x_{2}} . . . + \frac{1}{x_{n}}}$
Here $n = 2$
Harmonic mean $=$ $\frac{2}{\frac{1}{3} + \frac{1}{27}} = 5.4$

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