Method average

__test__/theorem.js:198–202

()

  	return [...arguments].reduce((a, b) => new BigNumber(a).plus(b))
  }
  average() {
  	const summed = this.sum(...arguments);
  	const average = new BigNumber(summed).div(arguments.length);
  	return average
  }
  correlation(array1, array2) {
      if (array1.length != array2.length) {
          throw "[TheoremJS]: Correlation error, arrays are not the same size"