Calculate the harmonic mean of the numbers: $13.5, 14.5, 14.8, 15.2.$

11.56

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12.15

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13.96

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14.65

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Solution

The correct option is B $13.96$
Harmonic mean $= \frac{n}{\frac{1}{x_{1}} + \frac{1}{x_{2}} . . . + \frac{1}{x_{n}}}$

$= \frac{4}{\frac{1}{13.5} + \frac{1}{14.5} + \frac{1}{14.8} + \frac{1}{15.2}} = 13.96$

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