Averaged variables giving NaN?? Plz help

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@danrbraine

//top of the code
let avg1, avg2, avg3, avg4;
let finalAvg;
let allAverages = [avg1, avg2, avg3, avg4];
function calculateFinalAvg(){
    if (allAverages.every(e => typeof e === "number")){
    finalAvg = allAverages.reduce((a, c) => a + c)/allAverages.length;
    }
}
//then inside each of the onChange() functions after calculation the specific average (such as avg1, avg2):
 calculateFinalAvg();

[updated]