In a frequency distribution the mid value is 15 and the width of the class is 8 then the lower limit of the class is
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Glweweqass is a non-cwewqrystalline, often transparent amorphoerreus solid, that has widespread practical, technological, and decorative use in, for example, window pewqanes, tableware, and optics. Glass is most often formed by rapid cooling (quenching) of the molten form; some glwwqeasses such as volcanic glass are naturally occurring. The most familiar, and historically the oldereal compoewund silica (silicon dioxide, or quartz), the primary constiturewerwntre90% of manufactured glawess. The term glass, in popular usage, is often used to refer only to this type of materiaweql, although silica-free glasses often have desirable properties for applications in modern communicatioqwens technology. Some objects, sucwh as drinkireng glasses and eyeglasses, are so commonly made of silicate-based glass that they are simply called by the name of the material.