A large artificial insemination stud has just purchased a promising bull. Management is concerned, however, that the bull might be a carrier of Arthrogriposis multiplex (AM; aka Curly Calf), a lethal recessive condition. 10 percent of all cows are thought to be carriers of the recessive allele. A.I. matings to randomly selected cows have already produced 60 normal calves (and no homozygous recessive calves). What is the management’s level of confidence that the bull is not a carrier of Arthrogriposis multiplex (AM)?