Answers for "array with total average"

how to calculate average of array in javascript

const arrAvg = arr => arr.reduce((a,b) => a + b, 0) / arr.length

get average and sum javascript

var sum = array.reduce((a, b) => a + b, 0);	//get sum of all elements in array
var avg = (sum / array.length) || 0; //get average of all elements in array ;)