Solve the problem please
Answers
Answer:
Marks (Xi). Cumulative requency. (Fi). Fi Xi
0-10. 5. 80. 3. 15
10-20. 15. 77. 5. 75
20-30. 25. 72. 7. 175
30-40. 35. 65. 10. 350
40-50. 45. 55. 12. 540
50-60. 55. 43. 15. 825
60-70. 65. 28. 12. 780
70-80. 75. 16. 6. 450
80-90. 85. 10. 2. 170
90-100. 95. 8 8. 760
100-110. 105. 0. 0. 0
EFiXi =4140
Mean=EFiXi/N =4140/80=51.75