An experiment consists of selecting a ball from a bag and spinning a coin. The bag contains 5 red balls and 7 blue balls. A ball is selected at random from the bag, its color is noted and then the ball is returned to the bag. When a red ball is selected, a biased coin with probability 2/3 of landing heads is spun. When a blue ball is selected a fair coin is spun. Find the probability that she obtains a head.
