One Kind of plant has only white flowers and pink flowers. According to genetic model, the offsprings of a certain cross have a 70% chance to be pink-flowering, and a 30% chance to be white-flowering, independently of one another. Two hundred seeds of such a cross are raised, and 155 turned out to be pink-flowering. We wish to determine if data are consistent with the model. What is expected value for the percentage of pink-flowering plants?