In August , tropical storm Isaac formed in the Caribbean and was headed for the Gulf of Mexico. There was an initial probability of that Isaac would become a hurricane by the time it reached the Gulf of Mexico (National Hurricane Center website, August , ).Let event Isaac becomes a hurricane by the time it reaches the Gulf of Mexico. event Isaac does not become a hurricane and remains a tropical storm when it reaches the Gulf of Mexico. event that Isaac passes over Cuba. a. What was the probability that Isaac would not become a hurricane but remain a tropical storm when it reached the Gulf of Mexico (to decimals)