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import { sum } from "./sum.ts";
/** * The mean, _also known as average_, * is the sum of all values over the number of values. * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency): * a method of finding a typical or central value of a set of numbers. * * This runs on `O(n)`, linear time in respect to the array * * @param {number[]} x sample of one or more data points * @throws {Error} if the the length of x is less than one * @returns {number} mean * @example * mean([0, 10]); // => 5 */export function mean(x: number[]): number {  if (!x.length) {    throw new Error("mean requires at least one data point");  }
  return sum(x) / x.length;}