math help

What does this website lead to ?

It's just a website commonly used for screenshots. It's safe, don't worry. Anyway, I'm afraid I'm not very good at these types of problems, so I can't help you.

Sorry! Someone like CPhill or someone who is much better than I am will come along and help.

I like this site       http://davidmlane.com/hyperstat/z_table.html

I got the address for this site from the Stick Topic labeled  " Reference Material "