Learn in the textbookDescriptive Statistics (Measures of Central Tendency and Dispersion)
DefinitionThe mean (平均値) is the representative value found by dividing the sum of all values by the number of values.
ExplanationA representative value sums up the center or typical shape of a data set with just one or a few numbers. Because the mean uses every value, a single value far from the rest (an outlier) pulls it strongly in that direction.
AnalogyPicture leveling block towers of different heights until they all stand equally tall; that shared height is the mean.