Just Satisfactory

Today i get my exam result already(so quick).My result is satisfactory.There are three band for the exam that are unsatisfactory, satisfactory, and excellent, and i get satisfactory.The range of marks is 0-8 for unsatisfactory, 9-15 for satisfactory, and 16-20 for excellent.I wonder what marks i get.My professor said that the total average mark for the whole class is 15.So the probability that i get below average is bigger i think.So sad and down.But luckily i didn't get unsatisfactory.