When labour is premature, incidence of breech presentation is higher. At 28 weeks' gestation 25% of babies are breech, and percentage decreases as pregnancy approaches term. If the sample of 200 from premature labors at 28 weeks gestation is taken, Determine the probability that the proportion of breech presentations is (a) less than 0.215 (b) between 0.22 and 0.274 (c) greater than 0.269?