Calculate arithmetic Mean by Direct Method from the given data
Marks
10 20 30 40 50
No. of students 10
30 40 35 25
Answers
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Answer:
marks. no of students. xifi
10. 10. 100
20. 30. 600
30. 40. 1200
40. 35. 1400
50. 25. 6250
total. 140. 9550
mean = 9550÷140
= 955÷14 = 68.21
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