Question

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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Answer 1

Answer:

your answer is here

Step-by-step explanation:

students = 60

marks obtained by number of students :

10 - 20 marks obtained by 1 student

20 - 30 marks obtained by 2 students

30 - 40 marks obtained by 3 students

40 - 50 marks obtained by 10 students

50 - 60 marks obtained by 7 students

60 - 70 marks obtained by 10 students

70 - 80 marks obtained by 20 students

80 - 90 marks obtained by 3 students

90 - 100 marks obtained by 4 students

average = mean

marks obtained by students

total number of students

total number of students = 60

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