Calculate harmonic mean for the following values $1, 3, 5, 7, 10, 12$ .

1.22

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2.22

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3.22

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4.22

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Solution

The correct option is D $3.22$
Given values of $1, 3, 5, 7, 10, 12$
Harmonic mean $=$ $\frac{n}{\frac{1}{x_{1}} + \frac{1}{x_{2}} . . . + \frac{1}{x_{n}}}$
Here $n = 5$
Thus harmonic mean $=$ $\frac{5}{\frac{1}{3} + \frac{1}{5} + \frac{1}{7} + \frac{1}{10} + \frac{1}{12}} = 3.22$

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