export declare function sum(xs: number[]): number;
export declare function mean(xs: number[]): number;
export declare function max<T>(xs: T[], mapper: (x: T) => number): T;
export declare function median(xs: number[]): number;
export declare function stdDev(xs: number[]): number;
export declare function variance(xs: number[]): number;
export declare function coefficientOfVariation(xs: number[]): number;