Need to reduce decimal places after averaging

Hello, I am looking to reduce the number of decimal places after averaging. 

The average that I calculated 3+1+1 is 1.666666666666667

and it is displaying that answer, but what I would like is that after adobe calculates the average, it will only give me two decimal places. 1.67

This is the code that I am using: 

var nSum = 0; nCnt = 0;

for(var i=1;i<=10;i++)

{

var nVal = this.getField("Proskills" + i).value;

if(!/^\s*$/.test(nVal) && !isNaN(nVal))

{

nCnt++;

nSum += nVal;

{

}
event.value = (nCnt > 0)?nSum/nCnt:"N/A";

After I input 

then event.value =(util.printf("%0.2f",nVal));

I am no longer able to change the average 

Can you please help me calculate an overall average and them reduce my results to two decimal places