Issue rounding result to 2 decimal places

Good day all,
I currently have a format script to get the average of 10 fields on my form that also skips empty fields. Here is my current script:
// Initialize variables
var num = 0;
var sum = 0;
// Check input fields
for (var i = 1; i < 10; i++) {
var f = getField("Assesment_Rating" + i);
if (f.valueAsString) {
// increment the non-blank field counter
num++;
// add the field value to the running total
sum += +f.value;
// Calculate the average
if (num) {
event.value = sum / num;
} else {
// If fields are empty, so set to blank
event.value = "";
As it currently works if I have a total of 1.4444444444444, that is what is displayed. I've tried a couple of Math.Round functions that give me "1.5" as a result which is not correct. I'm still learning so I may have tried a Math.Round function in the wrong part of my code, but cannot get the result I need.
Thanks in advance for your assistance!

That script should be a custom calculation script, which sets the field value. You can then set the format type to Number and two decimals.

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and
http://stackoverflow.com/questions/11469321/decimals-to-one-decimal-place-in-as3
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Hi All,
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the-java-guy-needs-help wrote:
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Issue rounding result to 2 decimal places

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