I'm stuck with b. I got the answer online but I don't understand because I thought u would multiply by 2 to get 2/6 .....because another question "how many heads would you expect Shay to get is she flips coin 20 times" is 1/2 x 20/1=20/2 = 10. I just don't understand why you do 1/6 X1/6 instead of by 2