Add a throw statement to the processNumbers function that throws the message "An element is not a number." if one of the elements in numberList is not a number. Hint: The function isNaN() returns true if the parameter is not a number.

function processNumbers(numberList) { // Code will be tested with different values of numberList var result = 0;

for (var index = 0; index < numberList.length; index++) { /* Your solution goes here */ result += numberList[index] * 1.3 * index; }

return result; }