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Loops and arrays

for loops are handy for traversing arrays. In the following example, the elements of an array are added together: 
let sum = 0;
for (let i = 0; i < myArray.length; i++) {
  sum = sum + myArray[i];
}

Exercise

Write a function mean that accepts an array filled with numbers and returns the arithmetic mean of those numbers.

Example: mean([1, 2, 3]) should return (1+2+3)/3 = 2.
To calculate the mean of n numbers, you have to add up the numbers and divide the obtained sum by n.
function mean(data) {

  let sum = 0;

  for (let i = 0; i < data.length; i ++) {
    sum = sum + data[i];
  }

  return sum / data.length;
};

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