Task 2. Assume that identical twins are always of the same sex, equally likely boys or girls. Assume for non-identical twins the firstborn is equally likely to be a boy or a girl, and so is the secondborn, independently of the first, Assume that 45% of twins are identical, 55% are non-identical. Find the following probabilities: 1. Probability of both boys. 2. Probability that the firstborn is a boy and the second is a girl. 3. P(secondborn is a girl firstborn is a boy) 4. P(secondborn is a girl firstborn is a girl)