How many student in classroom : 5                                                                                             
Input score of student 1 : 80                                                                                                 
Input score of student 2 : 70                                                                                                 
Input score of student 3 : 23                                                                                                 
Input score of student 4 : 49                                                                                                 
Input score of student 5 : 50                                                                                                 
Sum of all score is 281                                                                                                
Average of all score is  56.20                                                                                        
The number PASS of student is 3                                                                                   
The number FAIL of student is 2