Read this thread: http://www.mathhelpforum.com/math-he...pectation.html
Also this one: http://www.mathhelpforum.com/math-he...variables.html
Read this thread: http://www.mathhelpforum.com/math-he...pectation.html
Also this one: http://www.mathhelpforum.com/math-he...variables.html