how to take a mean of an array with using for loops

so i have to load data from a text file, choose the first column of data and find the mean while using for loops. So far I have this and then I am lost on how to find the mean of the data. I understand you can find the mean just by using the mean function but that is not what the homework question is asking

x=load('example.txt');

y=x(:,1);

Answer 1

[Star Strider]

The mean is the sum of the elements in your vector, divided by the number of elements in it.

You would begin with:

x = load('example.txt');
len_x = length(x);
sum_x = 0;
for k1 = 1:len_x
    ... YOUR CODE HERE ...
end
mean_x = ... YOUR CODE HERE ...

I could fill those in, but then you wouldn’t have the fun of discovering your own programming talents!

Note: Please do not use ‘sum’ or ‘mean’ as variable names. Those are the names of built-in MATLAB functions, and using their names as variables will overshadow those functions.