Which one is correct? Number 1 or Number 2. What am I doing wrong with the formula. I know for number one that I did not use ?=70 in my formula. Please no links to website. Can you show me step by step to see where I went wrong. n=4 ?=70 ?= 20 1. 20/?4= 20/2=10 2. 20-70/?4= 50/2=25