Determine the harmonic mean of the first five odd numbers.

1.79

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2.79

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3.79

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4.79

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Solution

The correct option is B $2.79$
Harmonic mean $= \frac{n}{\frac{1}{x_{1}} + \frac{1}{x_{2}} . . . + \frac{1}{x_{n}}}$
{ $n = 5$ ]
$= \frac{5}{1 + \frac{1}{3} + \frac{1}{5} + \frac{1}{7} + \frac{1}{9}} = 2.79$

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