Untitled

<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Lab Test">
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>Harmonic Mean</title>
</head>
<body>
  <h2>Harmonic Mean</h2>
  <p>
    Individual Score :
    <input type="text">
    <br><br>
    <input type="button" value="Calculate">
    <input type="button" value="Clear">
  </p>

  <h3>Harmonic Mean</h3>
  <table>
    <tr>
      <td>Sample Size</td>
      <td class="output"></td>
    </tr>
    <tr>
      <td>Total</td>
      <td class="output"></td>
    </tr>
    <tr>
      <td>Harmonic Mean</td>
      <td class="output"></td>
    </tr>
  </table>
<script id="jsbin-javascript">
var input = document.querySelectorAll("input")[0];
var calcBtn = document.querySelectorAll("input")[1];
var clrBtn = document.querySelectorAll("input")[2];

calcBtn.addEventListener("click", function() {
  var arr = input.value.split(",");
  var totalA = 0;
  for (var i = 0; i < arr.length; ++i) {
    var a = parseInt(arr[i]);
    totalA += 1 / a;
  }
  var Hm = arr.length / totalA;
  var output = document.getElementsByClassName("output");
  output[0].innerHTML = ": " + arr.length;
  output[1].innerHTML = ": " + totalA.toFixed(2);
  output[2].innerHTML = ": " + Hm.toFixed(2);
});

clrBtn.addEventListener("click", function() {
  input.value = "";
});
</script>


<script id="jsbin-source-javascript" type="text/javascript">var input = document.querySelectorAll("input")[0];
var calcBtn = document.querySelectorAll("input")[1];
var clrBtn = document.querySelectorAll("input")[2];

calcBtn.addEventListener("click", function() {
  var arr = input.value.split(",");
  var totalA = 0;
  for (var i = 0; i < arr.length; ++i) {
    var a = parseInt(arr[i]);
    totalA += 1 / a;
  }
  var Hm = arr.length / totalA;
  var output = document.getElementsByClassName("output");
  output[0].innerHTML = ": " + arr.length;
  output[1].innerHTML = ": " + totalA.toFixed(2);
  output[2].innerHTML = ": " + Hm.toFixed(2);
});

clrBtn.addEventListener("click", function() {
  input.value = "";
});</script></body>
</html>