A system has three macrostates. Macrostates 1 and 3 are least likely and have one basic state each. Macrostate 2 is the equilibrium state and is four times more likely to occur than either of the other two macrostates.

Part A
What is the probability that the equilibrium state 2 occurs?
Express your answer using three significant digits.
p2=

Part B
What is the probability that macrostate 1 occurs?
Express your answer using three significant digits.
p1=

Part C
What is the probability that macrostate 3 occurs?
Express your answer using three significant digits.
p3=
Part D
What is the sum of the probabilities for all macrostates?
Express your answer using three significant digits.