pls do it fast................
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CI. F. X. FX
10-25. 2. 17.5. 35
25-40. 3. 32.5. 97.5
40-55. 7. 47.5. 332.5
55-70. 6. 62.5. 375
70-85. 6. 77.5. 465
85-100. 6. 92.5. 555
F=30, Fx=1860
X = 1860 / 30
X= 62
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