Q:
      
      
         
            
Study the following histogram of marks in mathematics (out of 50) of students in a class and answer the following questions.
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If the students have got the marks out of 50 and if A+ grade has been declared for above 90%, then the number of students who have got A+ grade is
         
       
      
      
      
          
      
      
      
      
      
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