If the uniformity coefficient is greater than 5 then what does it signifies?

If the uniformity coefficient is greater than 5 then what does it signifies? Correct Answer Sand is non-uniform and is described by D40 size

A uniformity coefficient is determined by comparing the 40 percentile with 90 percentile. When the uniformity coefficient is greater than 5 then it signifies Sand is non-uniform and is described by D40 size.

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