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The following data shows the marks of 20 students in the mathematics exam out of 100. Then answer the following questions.
 
54, 7568, 9787, 75, 97, 68, 54, 75,87, 97, 68, 54, 75, 87, 68, 97, 54, 75.
 
Questions:
  
I)The mode of a given set of data is .
 
II) How many students scored centum in the mathematics exam?
 
 
III) How many students scored above 90 marks in the mathematics exam?
 
1