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Harmonic mean

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In mathematics, the harmonic mean is one of several kinds of average, and in particular, one of the Pythagorean means. It is sometimes appropriate for situations when the average rate is desired.

Harmonic mean for Beta distribution for 0 < α < 5 and 0 < β < 5

Harmonic Means for Beta distribution Purple=H(X), Yellow=H(1-X), smaller values alpha and beta in front

Harmonic Means for Beta distribution Purple=H(X), Yellow=H(1-X), larger values alpha and beta in front

Trapezoid

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In geometry, a trapezoid in North American English, or trapezium in British English, is a quadrilateral that has at least one pair of parallel sides.

The Temple of Dendur in the Metropolitan Museum of Art in New York City

Example of a trapeziform pronotum outlined on a spurge bug