function [m,s] = stat3(x) 
	arguments 
		x (1,:) {mustBeNumeric, mustBeFinite} 
	end 
	n = length(x); 
	m = avg(x,n); 
	s = sqrt(sum((x-m).^2/n)); 
end 

function m = avg(x,n) 
	m = sum(x)/n;
end