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# Statistical calculators

### Harmonic mean calculator

With this calculator you will calculate the harmonic mean.

### Weighted arithmetic mean calculator

With this calculator you will calculate the weighted arithmetic mean.

### Mean square, arithmetic mean of the squares, power mean of second order

With this calculator you will calculate the mean square or arithmetic mean of the squares also known as the power mean of the second order.

### Average absolute deviation, or mean absolute deviation (MAD)

With this calculator you will calculate the average absolute deviation, or mean absolute deviation (MAD), of a data set is the average of the absolute deviations from a central point.