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frequentcy
Applied to focusing lenses and mirrors, including telescopes, binoculars, and cameras, the focal ratio or 'F-number' is (the focal length of the lens or mirror) divided by (its aperture or diameter)
Define these Levels of Measurement.NominalOrdinalInterval/Ratio
A F-ratio test compares 2 variances and tell if they are significantly different. A Chi-square test compares count data.
lets see...lets apply a simple ratio... (56/f) = (64/100) 64(f) = 5600 87.5 = f = your answer O.O