Standard normal distribution, with the percentages for three standard deviations of the mean. Sometimes informally called bell curve. Used in probability theory and in statistics. Illustration. Vector premium vector by Furian

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blue vector curve illustration shape percentage standard line wave three symbol bell data measurement science symmetric symmetry shaped research random distribution graph chart theory mathematics statistics normal diagram rule average mean math stats statistic variable histogram uncertainty probability deviation gauss gaussian sigma probably empirical deviate normal distribution laplace bell curve deviations probability theory

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