Answer :
GIVEN:
FORMULA USED:
Arithmetic mean = 
∑f = 12 + 20 + 15 + 14 + 16 + 11 + 7 + 8
= 103
∑xf = 180 + 500 + 525 + 630 + 880 + 715 + 525 + 680
= 4635
Arithmetic mean = 
Arithmetic mean = 
= 45
CONCLUSION: Arithmetic Mean of given data is 45
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