Hmm 24+40x+7x+4.
Do combine like terms.
28+47x
Answer:
A) Construct a two-sample z -interval for the difference between population proportions.
P(Failure on first try) = 11/12
P(Failure on second try) = 10/11
P(Failure on third try)= 9/10
P(success on fourth try) = 1/9
P(success exactly on fourth try) = 11/12*10/11*9/10*1/9 = 1/12