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Mean of group A = (56+14+28+29+45+32+80+3+10)/9 = 31.11
Mean of group B = (27+24+18+19+5+16+22+10+6+20)/10 = 16.7
Difference = Mean of group A - Mean of group B
Difference = 31.11 - 16.7 = 14.41.
Therefore, the difference between the mean of group A and group B is 14.41.