I'm confused.

22. Genetics: Pea plants contain two genes for seed color, each of which may be Y (for yellow seeds) or G (for green seeds). Plants that contain one of each type of gene are called heterozygous According to the Mendelian theory of genetics, if two heterozygous plants are crossed, each of their offspring will have probability 0. 75 of having yellow seeds and probability 0.25 of having green seeds. One hundred such offspring are produced a. Approximate the probability that more than 30 have green seeds