The frequency(f0) of class preceding the modal class for the given distribution is
CI 5-15 15-25 25-35 35-45 45-55 55-65
f 6 11 21 23 14 5
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Keratin is one of a family of fibrous structural proteins known as scleroproteins. α-Keratin is a type of keratin found in vertebrates. It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, calluses, and the outer layer of skin among vertebrates.
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