calculate the arithmetic mean of the following grouped distribution by shortcut method
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CI. CM. F. xifi
10-20. 15. 5. 75
20-30. 25. 8. 200
30-40. 35. 12. 420
40-50. 45. 20. 900
50-60. 55. 3. 165
60-70. 65. 2. 130
total. 50. 1890
mean =xifi/fi. =1890/50 =37.8
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