A human disease known as cystic fibrosis is inherited as a recessive trait. For example, the possible outcomes of a child inheriting cystic fibrosis genes are CC Cc cC cc if the child's parents had one copy of each version of the gene so the probability of having a disease is 1/4. Find the probability that 3 out of 6 children of these parents will have a cystic fibrosis. (Round to 3 decimal places)