Of all federal employees, 72% are full-time employees. Of all not full-time federal employees, 37% are serving on a temporary appointment. Penny is a full-time employee. Grace is a federal employee serving on a temporary appointment. Based on the above information, which of these statements MUST be true? There is a 72% chance that Penny is a federal employee. There is a 37% chance that Grace is a full-time federal employee. There is a chance, with unknown probability, that Penny is not a federal employee. There is a 63% chance that Grace is a full-time federal employee. There is a 28% chance that Penny is not a federal employee