Definitions of mode, mean, median, range, variation, quartile, coeficient, deviation,

De·vi·a·tion[ˌdēvēˈāSH(ə)n]NOUNthe action of departing from an established course or accepted standard: "deviation from a norm" · [more]"sexual deviation" · "deviations from standard English"synonyms: divergence · digression · departure · difference · variation · variance · [more]aberration · abnormality · irregularity · anomaly · inconsistency · discrepancystatisticsthe amount by which a single measurement differs from a fixed value such as the mean.the deflection of a vessel's compass needle caused by iron in the vessel, which varies with the vessel's heading        co·ef·fi·cient[ˌkōəˈfiSHənt]NOUNmathematicsa numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g., 4 in 4x y).physicsa multiplier or factor that measures some property: "coefficients of elasticity" In descriptive statistics, the quartiles of a ranked set of data values are the three points that divide the data set into four equal groups, each group comprising a quarter of the data. A quartile is a type of quantile. The first quartile (Q1) is defined as the middle number between the smallest number and the median of the data set. The second quartile (Q2) is the median of the data.         

The linear equation is: y=ax+b