The frequency distribution of marks obtained by 60 students of a class are give below. MARKS. NO OF StUdents. 10-20. 1. 20-30. 2 30-40. 3. 40-50. 10. 50-60. 7. 60-70. 10. 70-80. 20 80-90. 3 90-100. 4 CALCULATE THE AVERAGE MARK
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Marks, No. of students, Marks, No. of students. 10-20 ... 20-30, 3, 60-80, 14. 30-40, 4, 80-90, 10. 40-50, 5, 90-100, 4. 50-60, 6 ... Here n=60 ⇒2n=30, therefore, 60-70 is the median class
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