interfacing a MCP9701

I am now attempting to get a more accurate result by finding the average of multiple temp results. The issue I am having is, when I find the average I am getting undefined and NaN from the output of the variable that I supposedly saved the average to. The issue I think is stemming from the way I am saving the temp value. Also, besides taking the average results, is there another way I could achieve a more accurate temperature?

My code:

function getResTempValue(x) {
    var temp;
    var avgTemp;

    for (var i=0;i<x;i++)
    {
      var vOut = E.getAnalogVRef() * analogRead(A0); // if you attached VOUT to Ao
      var vZero = 0.4;
      var tCoeff =  19.5 / 1000;
      var tempinc = (vOut - vZero) / tCoeff;
      var tempinf = tempinc * (9 / 5) + 32;

      temp = temp + tempinc;
      console.log(temp);
      if (i==x) {
        avgTemp = temp / x;
        temp = temp / x;
      }
      console.log(i);
    }

    console.log("Temp: " + temp + " Avg temp: " + avgTemp);
    return temp.toFixed(2);
  }
//IE getResTemp(5);