UPSKILL MATH PLUS

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Consider the following distribution:
 
Marks obtained Number of students
More than or equal to \(0\) \(63\)
More than or equal to \(10\) \(58\)
More than or equal to \(20\) \(55\)
More than or equal to \(30\) \(51\)
More than or equal to \(40\) \(48\)
More than or equal to \(50\) \(42\)
 
the frequency of the class \(30-40\)  is