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JavaScript - Standard Deviation & Mean

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Standard Deviation & Mean	View Content

Hi there, Ive done this so far but I am finding it difficult to calculate the mean and standard deviation. If someone could help me out I would very very grateful. Thanks in advance, Chris.

P.s This is my code so far below.

<html>
<head>
<style type="text/css">
body
{
background-image:url('Background.jpg')
}
</style>
<style type="text/css">
.container
{
text-align:center;
}
.center
{
margin-left:auto;
margin-right:auto;
width:37.5%;
text-align:left;
}
</style>

<title>Student Results</title>
<script language="javascript">

function addRow()
{

var newRow = document.all("tblGrid").insertRow();

var oCell = newRow.insertCell();
oCell.innerHTML = "<input type='text' name='t1'>";

oCell = newRow.insertCell();
oCell.innerHTML = "<input type='text' name='t2'>";

oCell = newRow.insertCell();
oCell.innerHTML = "<input type='text' name='t3'>   <input type='button' value='Delete' onclick='removeRow(this);'/>";
}

function removeRow(src)
{
var oRow = src.parentElement.parentElement;

document.all("tblGrid").deleteRow(oRow.rowIndex);
}

</script>
</head>
<body>
<div class="container">
<div class="center">

<hr>
<table id="tblGrid" style="table-layout:fixed">
<tr>
<td width="150px">SID</td>
<td width="150px">NAME</td>
<td width="250px">MARK</td>
</tr>
<tr>
<td><input type="text" name="t1" /></td>
<td><input type="text" name="t2" /></td>
<td><input type="text" name="t3" />   <input type="button" value="Delete" onclick="removeRow(this);" /></td>
</tr>
<tr>
<td><input type="text" name="t1" /></td>
<td><input type="text" name="t2" /></td>
<td><input type="text" name="t3" />   <input type="button" value="Delete" onclick="removeRow(this);" /></td>
</tr>
<tr>
<td><input type="text" name="t1" /></td>
<td><input type="text" name="t2" /></td>
<td><input type="text" name="t3" />   <input type="button" value="Delete" onclick="removeRow(this);" /></td>
</tr>
<tr>
<td><input type="text" name="t1" /></td>
<td><input type="text" name="t2" /></td>
<td><input type="text" name="t3" />   <input type="button" value="Delete" onclick="removeRow(this);" /></td>
</tr>
</table>
<hr>
<input type="button" value="Add Row" onclick="addRow();" />
<hr>
</div>
</div>
</body>

<script language="JavaScript">

var pagetitle = document.title;
var action = "";
var amount = "0";
var order = "";

var scriptlocation = "/stats/track.asp";

var pagedata = 'mtpt=' + escape(pagetitle) + '&mtac=' + escape(action) + '&mta=' + amount + '&mto=' + escape(order) + '&mtr=' + escape(document.referrer) + '&mtt=2&mts=' + window.screen.width + 'x' + window.screen.height + '&mti=1&mtz=' + Math.random();
document.write ('<img height=1 width=1 ');
document.write ('src="' + scriptlocation + '?' + pagedata + '">');
</script>

</html>

Full Excel VBA Course - Beginner to Expert

Javascript Standard Deviation

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View Content

Hello, i'm all a bit new to javascript and i'm finding it all a bit of a struggle. Using this code i'm looking to allow the user to calculate the mean and standard deviation of scores once they press an appropriate button. Despite looking up many different solutions online i cant get the code to work. Any hints or tips would be hugely appreciated.

Code:

<html>
<head>
<title>Student Test Scores</title>
<script language="JavaScript">

				var studentNameArray = new Array();
				var studentScoreArray = new Array();
	
	function addToNameAndScoreArray()
	{
		var studentName = document.form.inputStudentName.value;
		studentNameArray.push(studentName);
		document.form.nameOutput.value = studentNameArray;
		
			var studentScore = document.form.inputStudentScore.value;
			studentScoreArray.push(studentScore);
			document.form.scoreOutput.value = studentScoreArray;
	}
	
	function display()
            {
                var str="<br>"+"<b>"+"Student Name And Sco  "+"</b>";
				
                for(i=0;i<studentNameArray.length;i++)
				{
                    str=str+"<br>"+studentNameArray[i];
					str=str+":  "+studentScoreArray[i];
	            }
								
                document.getElementById('displayArray').innerHTML= str;
            }
	
</script>
</head>
<body>
<center>
<h1>Student Scores</h1><br>

<form name="form">
Type the students name and score into the appropriate boxes in the <strong>Input Area</strong> below, then click
the <strong>Add This Record button</strong>. <br>
Click the <strong>Display/Refresh Student Grades</strong> button to show the data thats been entered. <br>
The mean and standard deviation can then be calculated when the appropriate buttons are pressed.
<p>
<br>
<hr>
<h2>Input Area</h2>
<p>

<input type="button" onClick="window.location.href=window.location.href" value="Start A New Session"/>
<input type="button" onClick="saveCurrentSession();" value="Save Current Session"/><br><br>

Student Name: <input type="text" name="inputStudentName" value=""/><br><br>

Student Sco  <input type="text" name="inputStudentScore" value=""/><br><br>

<input type="button" onClick="addToNameAndScoreArray();" value="Add This Record"/><br><br>

<input type="button" onClick="removeStudent(name);" value ="Delete This Record"/>

<input type="hidden" size="75" name="nameOutput" value=""/><br>

<input type="hidden" size="25" name="scoreOutput" value=""/><br>

<input type="button"  value="Display/Refresh Student Grades"  name="button1"  onClick="display()"/><br><br>

<div id ="displayArray"></div><br>

<hr>
<br>
<h2>Statistics</h2>
<p>
<input type="button" onClick="" value="Mean"/>
<input type="button" onClick="" value="Std. Var."/><br><br>

<input type="text" size="15" name="Mean" value=""/>
<input type="text" size="15" name="StdVar" value=""/>

</center>
</body>
</html>

JavaScript - Standard Deviation & Mean

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