Height and weight are two measurements used to track a child's development. The World Health Organization measures child development by comparing the weights of children who are the same height and the same gender. In 2009, weights for all 80 cm girls in the reference population had a mean of 10.2 kg and a standard deviation of 0.8 kg. Weights are normally distributed. X~N(10.2,0.8) Calculate the z-scores that correspond to the following weights? a. 11kg b. 7.9kg c. 12.2 kg