six sigma

hello,

I have answered the questions in black and i need you please to answer the red part: 

1- step 3 in question 1

2- 2A

3- 3B

4- 4 & 5

i will attach my answer for question 1 step 1&2 and for 3A. 

i will attach all things you need.

thanks

the codes in the answer are just codes that represent initials and stuff like that for the professor.