Among the many letters sent to a popular advice to - the -lovelorn columnist, was one involving a paternity issue that raised an interesting statistical question. The distraught writer—call her “San Diego Reader”—said her husband is in the military and that she got pregnant the last day before he left for an extended tour of duty. Ten months and four days later the baby was born—usually a happy occasion—but her husband, accustomed to pregnancies being nine months long, became obsessed with the possibility that he might not be the child’s father. DNA testing was not yet available. The only relevant information known at the time was that pregnancy durations are normally distributed with a mean (μ) of 266 days and a standard deviation (σ) of 16 days. For the benefit of San Diego Reader’s husband, how would you associate a probability with a pregnancy lasting 10 months and 4 days? Do you think San Diego Reader is telling the truth?