2.A. A coin is tossed three times, the result being either Heads or Tails. Let X represent the number of heads obtained in the three tosses. The probability of obtaining at least one Head is Select one O O Sam plays archery. The probability that he hits the middle of the target ( the bull's eye) when he fires an arrow at the target is _. The expected number of arrows that Sam needs to fire at the target before he hits the bull's eye is Select one 0 8 0 2 O 16 0 7