find the mean by direct method for the following data Classes 10-20 , 20-30, 30-40, 40-50,50-60,60-70,70-80,
frequency:4,8,10,12,10,4,2
by step by step
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Answer:
Step-by-step explanation:
Class midvalue(m). F. Fm
10-20. 15. 4. 60
20-30. 25. 8. 200
30-40. 35. 10. 350
40-50. 45. 12. 540
50-60. 55. 10. 550
60-70. 65. 4. 260
70-80. 75. 2. 150
Total. N=50. Efm=2110
Mean= Efm/n = 2110/ 50 = 42.2
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