import type { UnionValue } from '../../treb-base-types/src/index';
export declare function extractNumbers(v: UnionValue): number[];
export declare function extractNumbersA(v: UnionValue): number[];
export declare function extractNumberPairs(a: UnionValue, b: UnionValue): [number[], number[]] | null;
export declare function mean(values: number[]): number;
export declare function sampleVariance(values: number[]): number;
export declare function populationVariance(values: number[]): number;