Liz is standing on the real number line at position 0. she rolls adie repeatedly. if the roll is 1 or 2, she takesonestep to the right (in the positivedirection). if the roll is 3, 4, 5 or 6, she takes two steps to the right. let xn beliz's position after n flips of the coin. Estimate the probability that X9o is at least 160.