I tried this code and it gives some strange errors please check why it is not passing

function betterThanAverage(classPoints, yourPoints) {
var TotalArray = 0;
for (var i in classPoints) {TotalArray += classPoints[i]};
var classavg = (TotalArray)/(classPoints.length);
//return classavg;

var classavgwithme = (TotalArray + yourPoints)/(classPoints.length+1);
//return classavgwithme;

if ((classavg < yourPoints) && (classavgwithme < yourPoints))
{return "true"} else { return "false"};

}