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According to the empirical rule,if the data form a "bell-shaped" normal distribution,________ percent of the observations will be contained within 2 standard deviations around the arithmetic mean.
Clay
A fine-grained natural soil material containing clay minerals, known for its plasticity when wet and used in ceramics.
Wallboard
A construction material made from gypsum and used in building for walls and ceilings, known for its fire resistance.
Gypsum
A soft sulfate mineral composed of calcium sulfate dihydrate, used in the construction industry and as a fertilizer.
Granodiorite
A coarse-grained igneous rock similar to granite but containing more plagioclase feldspar than orthoclase feldspar, commonly found in continental crust.
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