marks no of students (find mean) above0 80 above10 70 above20 72 above30 65 abov
ID: 2917920 • Letter: M
Question
marks no of students (find mean) above0 80 above10 70 above20 72 above30 65 above40 55 above50 43 above60 28 above70 16 above80 10 above90 8marks no of students (find mean) above0 80 above10 70 above20 72 above30 65 above40 55 above50 43 above60 28 above70 16 above80 10 above90 8
Explanation / Answer
marks no of studentsabove0 80 above10 70 above20 72 above30 65 above40 55 above50 43 above60 28 above70 16 above80 10 above90 8
we need to convert this to frequency table
marks no of student midpoint or classmark
91-100 8 95.5
81-90 10-8=2 85.5
71-80 16-10=6 75.5
61-70 12 65.5
51-60 15 55.5
41-50 12 45.5
31-40 10 35.5
21-30 7 25.5
11-20 8 15.5
1-10 10 5.5
mean= frequency *classmark/n
here n =80
mean= 95.5*8+75.5*2+.........+5.5*10/80
=53.3125
hope this helps
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