# How do I make a historgram, find the mean & SD using an array???

Hi,
If someone can help me, Id really appreciate it. The task is to input numbers (seperated by commas) into a textarea and then when the user clicks "plot" the mean and standard deviation appear in the appropriate textareas. In addition, a histogram is constructed from the numbers in the array. I have some code but it does not seem to work.

Can someone give me some tips. I am new at all this stuff.

David's Computer Program

var A = new Array();
var freq = new Array();

var A = s.split(",");

var mean;
var sum=0;

A = document.davidForm.main1.value.split(",");

function clearMainScreen() {
window.document.david.main1.value = "";
}

fucntion displayAvg() {
var mean = document.davidForm.main1.value;
for (var i = 0; i = A.length-1; i++) {
A[i] = parseInt(A[i]);
sum = sum + A[i];
}
mean = (sum / A.length);
}

function standardDeviation (){
var smsq = sum+sum
var stdr = Math.sqrt((smsq-smsq/A.length)/A.length-1))

for (var i=0; i=0 && A{i} <=9{
freq[0]=freq[0]+1
}
}

var bin = Math.floor(A[i]/10);

freq[bin] = freq[bin]+1

Math.random

for (var i=0; i<A.length; i++){
A[i]=Math.round(Math.round( )*100)
}

</script>

Welcome to David's Amazing Webpage

Mean

Standard Deviation